As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT L1 WINDOW HEAT OVERHEAT LIGHT CAME ON 2-3 MINUTES AFTER TURNING ON. GROUNDED - YES. INSPECTED & FOUND L1 WINDOW CB OPEN. PERFORMED CB WIRE INSPECTION REF B737-900 AMM 20-60-01. PERFORMED WINDOW HEAT OPS TEST REF AMM 30-41-00. SYS OPS NML.