[Rear Door magic locks]

Had the common problem - rear door wont unlock from the keyfob. Had to pull the chrome lever on the inside (it does lock OK though). Read the forums and bought a replacement return spring (cos they always break dont they!).

Dismantled the door - pulled out the actuator and found the spring - in perfect working order - bu@@er.

Put everything back together again and the damn thing worked perfectly - at least for two days - now its stopped again and I'm back to where I started.

What on earth is going on?