As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L1 WINDOW OVERHEAT LIGHT ILLUMINATED AFTER TAXI IN. ENGINE SHUT DOWN. OVERHEAT LIGHT ILLUMINATED AFTER POWER TRANSFER FROM APU TO GROUND POWER. GROUNDED - YES. CONFIRMED. BITE CHECK OF M321 FAULTS SENSOR. MOVED SENSOR SELECT SWITCH S1078 TO SPARE POSITION REF B737-900 WDM 30-41-11. L1 WINDOW HEAT NOW OPS NML REF B737-900 AMM 30-41-00. WHCU BITE PASS. ETOPS GND VERIFICATION TEST PASS.