As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L1 WINDSHIELD OVERHEAT ILLUMINATED AFTER ENGINE START. GROUNDED - YES. WHCU BITE PROCEDURE PERFORMED IAW B737-900 AMM 30-41 TASK 801 AND FOUND L1 WINDOW SENSOR @ FAULT CHANGED POSITION @ SENSOR SELECT SWITCH AND TEST FOR THE WINDOW HEAT CARRIED OUT. TEST OK A/C IS GOOD FOR SERVICE.