The door lock is to blame.I have replaced both in rear doors, the first one packing up in a 1 yo car.Recently after 6 years it refused to work again.I took it out ,dried ,lubricated and put it back.It's working so far.I think it's a design failure cause front ones are ok.My advice- if repaired, open and shut rear doors at least once every 3 days to remove moisture.
Marius
February 2009