1990 w124 (300D 2.5 Turbo) Central Locking Pump Failed......
 

The CLS failed some months back. I removed the supply pump (MB #124 800 06 48) from under rear passenger seat. Found motor had failed due to over-heating. Replaced motor. It now runs but I now find the next problem which caused motor to fail in the first place. The pneumatic actuator on the PC board that operates a toggle contact set has a leaky diaphragm. This leak causes a pump run-on problem. This is a sealed part so cannot repair. Where can I purchase a replacement for this actuator?????