Squealing Grinding Noise

SOURCE: FREEZER SOUNDS VERY NOISY

Fridge problem could be the fan is bad or that it is hitting ice. When the noise is kind of a buzzing like it is hitting ice...defrost your unit by unplugging and waiting a day or so for full melt out...then check your door gaskets for cleanliness and good seal.

Thanks.

SOURCE: Samsung RSE8KPUS noise

I have worked on refrigerators for 30 years but never worked on a Samsung. This is a WILD and I do mean WILD guess at what the noise may be. Don't use this information to attempt a repair but just to track where noise may be coming from.
There is a motorized damper door that opens and closes between the freezer section and the refrigerator section. My guess is that that damper assembly is what is making this noise. I can not tell you why it may be making this noise except that if is making the noise it probably is going bad. Remember this is just a guess and you will need to locate the damper assembly in order to try to pinpoint the origin of the sound. Your recording was wonderful and I wish more people in my everyday job would use their heads like you. I hope this sheds some light on the problem. Remember I am just guessing, don't spend money till you are able to verify cause.
Seems there would be a 1 year warranty on the frig.
supertechks

SOURCE: Fridge fan noise

Du musst den Abtausensor erneuern, ((Gelbes Kabel ))

SOURCE: loud noise from the freezer side

The problem is a buildup of ice on the plastic housing (the curved plastic bit) in the back of the freezer under the fixed shelf where the icetub goes. The fan behind this plastic housing is hitting the ice when the defrost comes on.

Unplug the fridge, unpack the freezer, remove the four screws in the back, take off the sheetmetal backing and let the fridge thaw. You can remove the plastic piece after a while and get the ice off (be careful not to remove the styrofoam insulation by going too quickly).

Reassemble and you're back in business, for a few months. I'm never buying Samsung again myself.

SOURCE: Refrigerator not getting cold in Fridge side

No. check this post from right here.
http://www.fixya.com/support/t245665-samsung_rs2556_refrigerator_side_not

Question: was the fridge running when you went to pick it up ?
Was it already on ?
My thinking is that you have the ice build up problem too and that it never thawed. If you unplug it, thawing could take days. Seriously. If you take the inside panel off and get some heat on it
only an hour or so.
You have the exact same model I do, and it works good, just designed poorly. It needs a drain hole on that condensor.
And your fan probably is fine. Do not spend $500.