Have Subaru Questions? Ask a Subaru Mechanic and Get Answers ASAP
I cannot tell you where the short lies but do have some advice.
Contact Subaru of America and open a case. Once you get them involved the dealer will be forced to use everything at their disposal and MAKE the time for them to resolve the problem. This may also prompt them to send in the district manager to help asses the situation on the car.
It sounds like the issue is possibly water intrusion in the driver side door lock cylinder or wiring, but without the car I can't be sure.
The number is ***** Working for the dealer I have seen these people help a great deal. One of the few car makers out there that really care about your business.
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