As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT SIDE (L2) WINDOW OVERHEAT ILLUMINATED TWICE DURING FLIGHT. GROUNDED - YES. ACCOMPLISHED WHCU BITE REF B737-900 FIM 30-41 TASK 801. PREVIOUS HISTORY SHOWED A WINDOW SENSOR FAULT. ACCOMPLISHED FIM 30-41 TASK 811. RESISTANCE OF THE WINDOW SENSOR WAS GOOD. REACCOMPLISHED BITE CHECK OF WHCU. NO FAULTS NOTED. GROUND VERIFICATION SUCCESSFUL.