I agree with Richard on the vacuum leak. That could be cycling your vacuum pump and eventually drawing the battery down. If you pull the fuse, when you go to open up the car a few days later, do the power door locks ALL work? If the door locks don't work then I would check the door vac elements.

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.