Originally Posted by Craig

Yellow/red is the circuit to lock the doors (yellow/green is unlock). The circuit starts in the drivers door at the master switch and feeds the other three doors, the fuel door and the trunk. The branch to the LR door is under the drivers side floor mat (check that one first). The branches to the RF and RR doors are under the passenger's floor mat. The common branch to the fuel door and the trunk lock are also under the passenger's floor mat. Just follow the circuit until you find the leak. My fuel door actuator has been replaced twice due to leaks, that may be a weak spot.

Edit: I just noticed you have a TD, so some of the details my be different than mine.