Boxster 986 frost issues

[DaveBBOXSTER]

Thank you Paul
- I did have a flooded CLU under the passenger seat (it's a UK car) a few years ago (as a bad split in the plastic roof screen let in water and the whole of the floor on the N/Side was in water)...had to remove seat and carpet and dry it all out...I have felt under there but seems dry.
Thank you Rick
- not sure if my 2000 year 986 has a rain sensor; I'd guess not as it's not listed as an option code in the spec. Not checked ignition switch for signs of damp...should I spray it with WD40 or open it up to dry it out?
What is funny (NOT REALLY) is the "on" light staying on the mirror heater switch EVEN with no ignition on and it staying lit EVEN with the fuse removed...Just makes no sense to me.

[DaveBBOXSTER]

UPDATE - Just gone out to check if light on mirror heater switch was still on. Looked in the light was off...
Tried to open drivers door (very gently) and the door glass stuck / didn't drop slightly (as it should) so I didn't force door open BUT the mirror heater light instantly came on! I pushed the door back an inch or so to shut it and light mirror switch stayed on...