I took the two halves of it apart (one larger Torx bolt, one clip) and removed the cover from the electrical half that has the motor in it (lotsa smaller Torx bolts), exposing the PCB. Reflowing all the solder joints on that PCB solved my problem. I added a little extra solder too for good measure but it probably wasn't necessary.
I hope that helps someone!
Do you have pictures of this process?
Tony
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Lapis Blue 03 Boxster S
Seal Grey 04 Boxster S (RIP 9-21-14)