In 2011 BMW issued a service bulletin for liftgate operation problems due to damaged wiring. Ask your dealer to check SIB 51-26-10.

Unfortunately this probably won't change the prognosis, but it might help you figure out where to look. If you can trace the wiring to wherever it's damaged, you might get away with splicing it and not having to replace the harness.

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Current Fleet:
2018 328d Xdrive Sport Wagon
2011 X5 Xdrive 35d
1973 2002 tii
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Past loves:
2015 i3 REX
2011 535i Xdrive
2005 X5 4.4i
2003 530i
1999 528i
1995 525i