I bought a condo a few years ago whose finished basement includes a U-line combo 75FF. There were no owner's manuals with the frig when I bought the place. I have problems with what seems like a noisy motor. Can't be sure how old frig is, but at least 3 years or so. Frig seems to run fine for a while before a continuous and not too soft noise begins. Wondering where to turn to diagnose and fix. Thank you! Phil Hockenberry