Parking Brake malfunction - 2010 A4 Avant
 

Looking for some direction please.
Not sure if this is water related as passenger window was left over the night before this issues started, seat was soaked and there was water on / around parking switch and gear stick.

Parking brake will not release and warning light on dash reads *PARKING BRAKE MALFUNCTION* , strange thing is, last week on a cold morning this happen but only for a few second. I though maybe I just drove too soon after starting on a very cold frosty morning. It pulled again after I stopped to let the children off at school - I pulled over on the other side of the road, parked and took off again and it was fine.
Then yesterday morning (very old and frost) it wouldn't release, gear stick also felt frozen/stuck... left it running for an hour with heaters on.. poured warm water over back calipers and still no joy.. a while later in the day the warning light then displayed. Gears now moving with no issues.

Plugged into machine and fault code read 03200 - anyone know if this is the switch that's the problem or sensor possible?
thanks all.