As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FWD WINDOW OVERHEAT LIGHT ILLUMINATED DURING CLIMB. LIGHT STAYED ON AFTER QRH PROCEDURE ACCOMPLISHED. GROUNDED - YES. REMOVED P59 PANEL NO FIX. REINSTALLED ORIGINAL P59 PANEL IAW B737-800 AMM 30-41-41. REMOVED AND REPLACED LEFT FWD #1 WINDOW IAW AMM 56-11-11, REMOVED AND REPLACED WINDOW HEAT CONTROL UNIT LEFT FRONT IAW AMM 30-41-11. ALL OPERATIONAL CHKS GOOD.