I'm not sure if this helps or not, but I had a couple of parking brake malfunctions recently in the cold weather - for about 3 days straight, however, I suspected that the cold weather and err, leaving my lights on all day meant that the battery was low.
Sure, enough, cleared the codes in VCDS, shoved the car on the CTEK overnight and voila, two weeks so far of driving with no parking brake malfunction errors and no codes logged.
Might be worth a try mate
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