Used part for main volume: RK09K12C0A2S

The original has a 503B code, the item above has an A curve, but this seems unobtainable.
The 503A works, it just has a different curve.

Potmeters:

Output: PDB182-K420K-103B1
Input: PDB182-K420K-103A

The synth has a small daughter-PCB with the OLED, so it’s easy to get it out and work only on this part.
To replace a defective OLED screen on the Dave Smith Prophet Rev2 synthesizers, you can:

• Approach the customer service 😅. I got one for a fair price. No soldering required.
• Order an Adafruit 128×128 OLED and transfer the actual OLED-display to the pcb-module of the synth. I’ve done this, and it works.
  To get the screens off the PCB I’ve used a thin wire (to slice through the double-sided tape) and some alcohol.
  Be aware of heat, so make sure the flex-cable is folded, and the OLED is on the back of the PCB, relatively safe from heat. A soldering iron and flux was my way to go. I’ve destroyed one screen with hot air 🙁
• (Not tested, but I assume the GME128128-02 OLED module uses the same OLED)
• (You can also search for keyword: SSD1327)