As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R2 WINDOW OVERHEAT LIGHT ILLUMINATED. GROUNDED - YES. PERFORMED WINDOW HEAT SYSTEM OPERATIONAL TEST PER B737-900 AMM 30-41-00-710-801. OPERATIONAL TEST GOOD. PERFORMED WINDOW HEAT CONTROLLER BITE TEST PER AMM 30-41-11-710-801. BITE TEST GOOD. NO DEFECTS NOTED. NO FURTHER MAINTENANCE ACTION NECESSARY.