How to adjust the temp on a true sandwich bar It's running to cold?

If it doesn't respond to the adjustment on the temperature control I would think it has an improper refrigerant charge. You need to remove the existing charge and weigh in the new charge. It has to be exact for the temp control to respond and sense properly. Some times when the refrigerator is slowly losing its charge from a leak you will have long running times and the refrigerator will get too cold and then suddenly wont cool at all. Check the condenser to make sure that its plenty clean. An overheated system will cause long run time. Temp controls don't generally fail and I would be slow to just change it without looking the system over good for leaks. You may have to call someone in to check it out. Hope this helps and good luck.

Turn down the temp and move produce item closer to the front. The air exits the evaporator at around 28 degrees. Possible you need a thermostat.

The True thermostat sits on the evaporator in a piece of tube attached to the coil. If it won't switch off at your required temp even at position 1 you can use an air temperature type thermostat in it's place. It will sit in the same place but the sensing end will coil up behind the fan. Get a bar fridge thermostat and it'll adjust to your needs.

You will need to adjust the thermostat.
The thermostat will be hidden at the bottom back of the fridge near the compressor.
You may need a screw a flat blade driver driver to adjust the themostat

first place to look would be the freon level. It sounds like there is a slow leak and freon level is going down. Start there and let me know if I can help any further.

Look for doors not properly closing, poor air flow over coil or something blocking air flow, improper freon level.
http://www.truemfg.com/pdf/InstallManuals/TPP_TSSU_TUC_TWT/tuc_english.pdf
check out this web site as it has a manual for your equipment. it has lots of good info. Hope this helps. If you need more help, let me know.

Ice cream is usually kept at -10 degrees to stay firm. Need to check temperature. Look at condenser coil for cleaning. This is usually the most simple and common issue. If not making the desired temp, and the temperature control is set for that temp, and compressor run constant, it is a refrigeration issue. If compressor does not run constant, then a control issue.

I wonder if you have this problem below caused by a drop in water pressure from someone flushing a toilet or a washing machine. I would call the company to remedy this issue.

17. What is a cold water sandwich effect? The term “cold water sandwich effect” is a term that is used to describe the introduction of cold water into the hot water supply line during frequent on/off operation of an instantaneous water heater. The cold water sandwich effect, when present, appears as a momentary drop in hot water temperature as it is discharged from a hot water supply outlet (i.e. shower, tub, or faucet). This phenomenon is present in the operation of all instantaneous, tankless style, water heaters, but is minimized with the high tech design of Rinnai water heaters.
The technology built into the Rinnai water heaters is designed to minimize the cold water sandwich effect. Rinnai water heaters are microprocessor controlled and when water flow through them ceases, they remain in a “ready to fire state” for approximately 1 minute. If water flow through a Rinnai water heater begins within the first minute following water flow stoppage, the water heater will fire back up within 1 to 2 seconds. This minimizes the cold water sandwich effect that would otherwise be experienced with a low tech tankless water heater. It should be noted that the cold water sandwich effect cannot be removed completely from tankless style water heaters. The safety standards developed to insure the safe operation of water heaters require a delay in the ignition sequence of all gas water heaters.
While the cold water sandwich effect cannot be completely eliminated from standard plumbing systems, it can be eliminated from plumbing systems that have a supply and return hot water circulating system. Rinnai has developed 2 methods to eliminate the cold water sandwich effect in residential hot water circulating systems.
The first (and preferred) method to remove the cold water sandwich from circulating systems utilizes a small electric tank water heater (powered up) that is used with a dual purpose. The small water heater acts as a mixing tank to eliminate the cold water sandwich effect from the Rinnai water heater and it uses its electric heating element to offset the heat losses from the hot water circulating system.
The second method to remove the cold water sandwich from circulating systems utilizes a small 2 to 6 gallon storage tank installed on the hot water outlet of the Rinnai water heater. This tank acts as a mixing tank to blend the cold water sandwich with hot water and eliminating its effect at fixtures.

I had a similar problem, & found out that what was making the noise is the cardboard siding on the condensor(bottom of the cooler) I placed a "shim" between the cardboar and that took care of the noise.

thermostat is stuck closed, if not compressor relay is stuck closed, if not then the defrost timer is stuck closed. test the components in that order.