I picked up my keyboard, and the Yamaha repairman said he removed the old grease, (seemed thin) and applied the new grease supplied by Yamaha (seemed thicker) He noted that it could have been the wrong type of grease, or applied incorrectly at the factory, or simply not enough.

But anyway, it works perfect, and he said it should last for many years like a new one should.

Short videos BEFORE and AFTER grease repair

BEFORE: (Thanks Sam Hodgson)


AFTER: