As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING A R1 WINDOW HEAT TEST AFTER CHANGED, FOUND THE L1 FWD WINDOW OVERHEAT OVERHEAT LIGHT ON. COULD NOT RESET. ACFT GROUNDED. ACCOMPLISHED WINDSHIELD HEAT BITE, FOUND AN L1 SENSOR FAULT. MOVED SWITCH TO SPARE POSITION. OPS GOOD. GROUND VERIFICATION SUCCESSFUL. IAW AMM 30-41-11-710-801, AND 30-41-00-420-801.