As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT SIDE WINDOW HEAT INOPERATIVE. ACFT GROUNDED. WINDOW TEMP SENSOR & HEAT FILM RESISTANCES NOMINAL. PIGTAIL CONTINUITY RINGS GOOD. ON LIGHT WOULD NOT ILLUMINATE. POWER TEST RESTORED NORMAL OPERATION THEN FAILED AGAIN. RERACKED LT SIDE WHCU. FAILED AFTER 8 MINUTES. R & R LT SIDE WHCU. OP CK NORMAL REF FIM 30-41, TASK 809.