As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SECOND WRITE UP OF RIGHT SIDE WINDOW HEAT OVERHEAT ILLUMINATED AND EXTINGUISHED PER QRH IN CLIMBOUT. GROUNDED - YES. ACCOMPLISHED WINDOW HEAT CONTROL UNIT BITE PROCEDURE REF B737-900 FIM 30-41 TASK 801. FOUND ON NO1 WHCU WINDOW #1 P5-9 FAULT AND ON NO2 WHCU WINDOW #2 P5-9 FAULT. INITIATED B737-900 FIM 30-41 TASK 813. REMOVED AND REPLACED P5-9 PANEL REF B737-900 AMM 30-41-41/401 OPC GOOD. PITOT PROBE, AOA SENSOR AND TAT PROBE HEATER SYSTEM AMM TASK 30-31-00-730-801 PASSED. ACCOMPLISHED BITE OPC GOOD. GROUND VERIFICATION SUCCESSFUL.