As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT RECEIVED OVERHEAT LIGHT ON LEFT SIDE COCKPIT WINDOW (L2) ACCOMPLISHED QRH CHECKLIST "ON" LIGHT DID NOT ILLUMINATE AFTER ACCOMPLISHING CHECKLIST PROCEDURE. GROUNDED - YES. LEFT SIDE WHCU FAULT HIST LOGGED MULTIPLE SENSOR FAULTS. REF B737-900 FIM 30-41 TASK 811, MOVED SENSOR TERMINAL TO SPARE SENSOR TERMINAL, WHCU BITE GOOD W/O FAULTS. LEFT SIDE WINDOW HEAT OPS CHECKED OK.