Vintage Synth Repair

Please, anyone any experience with Roland AT10S small 2 manual organ
that seems to have come with a amplifier that died in a couple years.
( they seemed to have stopped  selling them)

I own 2, one in my home & one at rest home where I play. 

After several years sound went distorted. Play 'em now plugged into Guitar speaker. 

Paid Roland repairman $ 75.00 to look & he could do nothing.

Had several emails with Roland people who evidently find out nothing can be done and they stop answering the emails. 

Hope someday someone gets the fix...