When the power is on the stepper wont slow down and you cant adjust the level

There is help here, but this is a very specialized RV toilet system.

https://www.google.com/search?q=tecma+toilet+has+a+slow+drain+of+water+in+bowl

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Blower motors with could be stuck. Replace the adjustment switch in your dash.

The circuit board controller is monitoring the engine rpm and frequency and thus controls the frequency, via the governor actuator, or stepper motor as you say. You can't adjust it. I doubt this is the problem it sounds like either engine is not delivering HP, or there is a stator short causing excessive load / current draw bogging the unit down, incorrect wiring of the stator output. Ha someone taken the stator output leads off the breaker? check the stator resistance and shorts to ground.

turn on i hope you know that part
adjust the resistance settings like to light then get on and start walking like climbing steps

This sounds like the fuel level sensor in the gas tank is going bad, or there is a bad ground at the tank. A technician using a scan tool can monitor the actual fuel level data to verify.
Another possibility is a bad stepper motor in the instrument panel, each gauge had a stepper motor to drive the needle.

OBD 1 it wont give it and key off the memory resets itself . your source of the problem is the IAC this is a stepper motor a worn one will do exactly what is happening to yours its movement is a jack screw and it tend to get worn moving in one direction then the other after so many miles it just cant turn the pintle anymore and wears out, That or the ECT is not giving the correct temp. Just take care of the IAC and your done

This machine works off of gravity and requires a minimum of 120 lbs to function correctly. So without knowing what "lightweight females" is exactly, I am assuming they weigh less than 120 lbs.

Stairmaster Stepper 7000PT Stepmill Parts Transmission SPORTSMITH net

Sounds like the power supply/motor drive board is bad. You might consider a new printer or repair the power supply. The printer is obsolete and only a few parts are currently available from Sato

its the tilt thing, you have to have it replaced for $200, or go to a mechanic and have him adjust it the level you want and let him deactivate the tilt from electricity. Best thing I ended up with my millenia :)