Yes previous posters are correct, it is water ingress into the boot release, called a grip strip. It corrodes the micro switch and becomes inoperable. The parts do not come separately, it is an entire grip strip. They are easy to replace yourself, open the boot, pop off the liner then unscrew the four T20 screws that hold the grip strip on. Disconnect the small electrical connector (make sure you don't lose it in the tailgate!) and install the new grip strip in reverse of removal.
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