As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT SLIDE WINDOW "L2" OVERHEAT LIGHT ILLUMINATED. GROUNDED - YES. PERFORMED WHCU BITE PROCEDURE REF B737-900 FIM 30-41 TASK 801, NO CURRENT FAULT NOTED, FOUND HISTORY FAULT "P5-9 CONTROL POWER" LIGHT. RESET LEFT SIDE WINDOW HEAT, OPS CHECK GOOD.