As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT SIDE WINDOW OVERHEAT WHEN SELECTED ON. GROUNDED - YES. PERFORMED WINDOW HEAT CONTROL UNIT BITE PER B737-900 FIM 30-41 TASK 801 WHCU FAULTED WINDOW SENSOR. PRIMARY SENSOR RESISTANCE IS OUT OF RANGE PER B737-900 AMM 30-41-21-760-801. MOVED TERMINAL TO SPARE SENSOR PER SAME AMM. OPERATED WINDOW HEAT FOR 30 MINUTES WITH NO OVERHEAT RE-ACCOMPLISHED WHCU BITE NO FAULTS NOTED.