As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L1 WINDOW OVERHEAT LIGHT ILLUMINATED IN FLIGHT. COMPLIED WITH QRH, LIGHT REMAINED ILLUMINATED WHEN TURNED BACK ON. COMPLIED WITH REMAINING QRH PROCEDURES. ACFT GROUNDED. FOUND THE CIRCUIT BREAKER OPEN. RESET THE CIRCUIT BREAKER IAW AMM 20-60-01 NORMAL OPS RESTORED.