via this auction
"This unit has recently been serviced. This is the MK1 white face model with the 4023 filter. Many things were done recently. New keyboard bushings, replacement of capacitors, rebuilt power supply, retuned and calibrated, all circuit boards removed and cleaned, all sliders removed and cleaned also re greased to factory spec, keyboard bed straightened, keyboard contacts cleaned, new slider caps except the pink ones which are original."
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