via this eBay listing
"This particular unit has just been professionally serviced by Bell Tone Synth Works in Philadelphia, ensuring long-term reliability. Part of their work Known for their meticulous synth repair and restoration, Bell Tone’s work guarantees that this Matrix-12 sounds as bold and warm as the day it left the factory.
Service Highlights include -
Rebuilt power supply: replaced main rectifier diodes, all polarized capacitors, and voltage regulators
Replaced memory battery and reloaded factory presets
Installed ground noise service change: added 47 ohm resistor between chassis and bottom voice board, and changed C105 to 1nF capacitor. This reduces noises that causes some voices to randomly fail autotune
Installed new control panel overlay from Sweet Discrete UK, the best overlay available
Cleaned pots"
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