I read many posts regarding central lock failure but could not find help with my problem. System failed. I have lumbar seats so there are 2 ports on the pump. The vacuum port for the locks was broken off. I used epoxy plastic bonder from Loctite to repair and put it all back in place. The locks worked to some extent. The driver and passenger door would lock and unlock all doors, and the truck but not the fuel door. I kept working with the system and after a while the pump quit working. It was very warm. I let it cool down and it started running again. Now nothing works. I can only lock the driver or passenger door individually with the master key. The "C" and "A" fuses are good. At a loss as to what to do next. My 1991300E 4matic has 178K on it. Any and all suggestions will be greatly appreciated.

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Handyjay