A few years ago a couple of my door actuators were starting to getting lazy in my '04 sport, so I bought 4 new ones from Ford and replaced all 4. Recently I noticed my drivers door would unlock but not lock by the switch, the remote or the auto lock. The only way to lock the drivers door was manually push the plunger at the top of the door down. It would unlock no problem by remote, switch and by the interior door handle. Thinking I had a bum actuator in the drivers door I bought another from Ford but the problem persists. Only thing I can think of left is the drivers door module. Since the drivers door has it own relay in the module separate from the rest of the doors its my thought that the relay for the driver door gets the most use due to the two stage unlocking compared to the others. Anyone else have something similar happen? Any fixes like a resolder job for that relay?