These have just one real moving part, an inner fan, if unit has become over noisy it will just be the small inner fan. It is located inside unit and is pretty easy to swap over. There is one in top and one in bottom section.

Part
Fan replacement code BCWH-69-FAN-TOP, cost $49.00
Fan replacement code BCWH-69-FAN-BOTTOM, cost $49.00
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