As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN R FWD WINDOW HEAT SWITCH IS SELECTED ON OVERHEAT ILLUMINATES. REMOVED AND REPLACED WHCU DUE TO LRU FAIL LIGHT ILLUMINATED AND TESTED FOR FAILED SENSOR. TRANSFERRED TO SPARE SENSOR AND OPS CHECK GOOD REF AMM 30 41 11. SYSTEM GROUND VERIFIED GOOD.