As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R-2 WINDSHIELD OVERHEAT RAN QRH PROCEDURE OVERHEAT RE-ILLUMINATED AGAIN. TURNED OFF R-2 SWITCH FOR DURATION OF FLIGHT. GROUNDED - YES. ACCOMPLISHED WINDOW HEAT CONTROL UNIT SYSTEM TEST CLEARED SENSOR FAULT AT RIGHT SIDE WHCU. OPS CHECK RIGHT SIDE WINDOW HEAT SWITCH NO OVERHEAT LIGHT ILLUMINATED SYSTEM FUNCTION TEST NORMAL IAW B737-900 AMM 30-41-11-710-801.