As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FORWARD WINDOW OVERHEAT LIGHT ILLUMINATED IN CRUISE. FOLLOWED QRH PROCEDURE-OVERHEAT LIGHT REMAINED ILLUMINATED WITH SWITCH ON. GROUNDED - YES. FOUND L1 WINDOW C/B POPPED. RESET C/B PER B737-900 AMM 20-60-01 PAGE 201. L1 WINDOW HEAT OPERATES NORMAL.