As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND 25 AMP PITOT HEAT REMOTE SWITCH MODULE SHORTING AND ARCHING BEHIND PILOT SIDEWALL. MODULE LOAD SIDE ATTACHMENT STUD FELL FROM UNIT AFTER WIRE REMOVAL. MODULE BUS SIDE ATTACHMENT WIRE WAS BURNED AND ARCHING CASE OF UNIT. REPAIRED WIRING AND INSTALLED NEW MODULE ASSY. MFG WAS NOTIFIED OF FINDINGS.