As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT SIDE WINDOW HEAT INOPERATIVE. TRIED RESET IAW QRH STILL INOPERATIVE. FAULTS CONTROL UNIT, REPLACED WHCU M191, NO HELP. SWAPPED M191 & M192, NO HELP. STILL FAULTS CONTROL UNIT. ALL WHCU INSTALLED IN ORIGINAL POSITION SEE SEQ 8322006 FOR COMPLETION.