via this auction

Full disassembly and deep cleaning inside and out.
Power supply rebuild.
Recalibration.
Replacement of all tantalum capacitors.
Removal and replacement of all rubber key bushings.
Cleaning of all key contacts.
Cleaning of bus bars.
Adjustment of keys.
Replacement of all potentiometers (approximate parts cost $300)
Cleaning of all switch contacts.
Replacement of power cord.
Post-restoration, this unit works like new again and is a real pleasure to play. Sure to make its next owner really happy. This unit is much better than the rest and is priced to reflect the investment we made to make it better than others on the market.
sn28235x"