As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT SIDE L2 WINDOW HEAT OVERHEAT LITE ILLUMINATED DURING PREFLIGHT. -FOLLOWED QRH - LIGHT WAS OFF AFTER 3-5 MIN COOL DOWN - THEN OVERHEAT LITE CAME BACK ON AFTER 5 MINS. GROUNDED - YES. RESET SYSTEM, OPS CHECK GOOD, AMM REF 30-41-00-710-801.