You can drop the lower door panel only but you still have to deal with the remote mirror cable (tiny set screw), power lock switch connector (has a speed nut on it) and concert sound speaker wires (barely long enough, pull off speaker terminals with some needlenose while lying on your back under the door). A real door panel tool (basically a forked screwdriver, not that flimsy 22 gauge steel joke-of-a-tool on the HELP! rack) makes things easier. Then just peel the moisture barrier up and tape it up out of the way. I agree with you that a cleaning/lubing is probably the cure. However, my old ElCamino that I converted to power locks needed the driver side actuator replaced; it moved partially also. Replacement requires drilling the rivets out that attach it to the door frame. I reattached it with small nuts/bolts/lockwashers.