It was the rear window. Confirmed by the BMW dealer. They also stated that the REM wasn't providing enough power to the defroster, but that it might have gone into a protection mode from sensing an open circuit. Replacing the window fixed the problem. No need to replace the REM, I cleared the codes and tested it and it's working now.
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'14 Evora S - Chrome Orange/Ebony
'02 M5 - Carbon Black/Silverstone
'15 M235i xDrive - Mineral Grey/Black
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