The washer was running fine and just as quiet as the day we bought it. So, I could only think of build up being between the inner drum and the outer drum. I dismantled the washer to the point of pulling the inner drum out. Once I got the agitator out, I could tell the seal between the two drive shafts was leaking grease into the unit. So ordered a new transmission and drive hub kit. Replaced them, calibrated the unit and tested for leaks. About 5 loads of laundry in and no problems.