One more thought on repairing your PianoLodeon.  The motors are very
small and drive a large diameter impeller, and the lubrication has
undoubtedly dried up on these motors.  Both of my units had this
problem.

Use a spray lube or light machine oil (but not WD-40) and try to work
it into all the bearings.  The solvents in WD-40 will evaporate leaving
a sticky grease residue.  Even after this lubrication, the motors take
several seconds to come up to speed after switching them on.

Ray Fairfield