As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R2 WINDOW HEAT OVERHEAT. GROUNDED - YES. WHCU BITE TEST PASSED TEST OK REF B737-900 FIM 30-41 TASK 801, PERFORMED RESISTANCE TEST OF WINDOW HEAT FILM & WINDOW TEMP SENSOR BOTH TEST PASSED WITHIN LIMIT REF B737-900 AMM 30-41-21, PERFORMED WINDOW HEAT TEST NORMAL AMM 30-41-00.