As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PRE FLIGHT, L FWD WINDOW HEAT OVERHEAT ILLUMINATES WHEN SWITCHES SELECTED ON. GROUNDED - YES. FOUND B9 C/B ON P6-11 OPEN. PERFORMED C/B RE-SET PROCEDURE IAW B737-800 AMM 20-60-01-860-801. PERFORMED WHCU BITE CHK, NO FAULTS IAW B737-800 FIM 30-41 TASK 801.