Some keys on my Roland XP60 keyboard are playing multiple notes, sound like playing several random keys at once. When I press a single key I hear 5 or 6 notes playing together which is noisy and sense less. I tried several things, cleaned the contact board, cleaned the contact strip with alcohol swaps, replaced the contact board with a used one purchased from Syntaur, but did’t change anything, the keys are still playing multiple notes. Anyone have any suggestion on what I can do or replace. It’s 24 years old friend, so special attachment.