As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT SIDE WINDOW OVERHEAT LIGHT CAME ON ON CLIMBOUT. QRH RAN, LIGHT WENT OUT. GROUNDED - YES. PERFORMED B737-900 FIM 30-41 TASK 811, TO RECONNECT/TRANSFER PRIMARY WIRE TO SPARE. BIT VERIFY OK. BIT TEST OK (GREEN LIGHT) CAME ON. NO FAULT NOTED. OPS NORMAL.