As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CHRONIC LT SIDE WINDOW HEAT. SWAP WHCU'S TO DETERMINE IF HARD FAULT OF 'SENSOR 3' FOLLOWS THE BOX. RECORD MR DASH NO'S FOR EACH ORIGINAL POSITION. SWAPPED WINDOW HEAT CONT'S. PERFORMED WINDOW HEAT TEST, REF MM 30-41-00 -401 AND 'SENSOR 3' FAULT REMAINED ON WHCU M192. FOUND MR30415-186 IN M191, MR30415-267 IN M192 BEFORE SWAP. LEFT BOXES IN SWAP POSN'S (-267 IN M191, -186 IN M192).