As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L-1 WINDOW HEAT OVERHEAT LIGHT WILL NOT RESET. GROUNDED - YES. CHECKED L-1 WINDOW - DARK BROWN MARK NEAR PWR BUS TERMINAL 4, DELAM AND ARCING. ACCOMPLISHED B737-800 FIM 30-41 TASK 801 BITE CK - "P5-9 1 CONTROL PWR" FAULT. ACCOMPLISHED FIM 30-41 TASK 814 - L-1 WINDOW HEATER RESISTANCE CHECK TERMINAL 3 AND 1 - 7.12 OHMS. REMOVED AND REPLACED L-1 WINDOW PER 737-800 AMM 56-11-11/401.