This scotsman Icemaker, NSE654 model, make very loud squeaking noise. sound like its auger or gear turning and trying to overcome some kind of friction between its internal parts. I open up the evap. assembly and found out that its bearing was out and oil leaked into the ice bin. I replaced the bearing and top seals and the machine ran about 45 min. making ice as normal but then this noise came. Any suggestion on where to look at. factory charge call for 25 oz and i got 21 oz out.