As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L-SIDE WINDOW HEAT "OVERHEAT" LIGHT ILLUMINATED. COMPLIED WITH QRH. LIGHT DID NOT RE-ILLUMINATE. GROUNDED - YES. CHANGED THE WIRES FROM THE PRIMARY SENSOR TO THE SPARE SENSOR REF B737-800 AMM TASK 30-41-00-420-801. WHCU BITE TEST PASSED FOR THE L-SIDE WINDOW REF AMM TASK 30-41-11-710-801.