As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT FWD WINDOW HEAT OVERHEAT LIGHT ILLUMINATED INFLIGHT AT FL 330 43 SAT AND REMAINED ILLUMINATED AT COMPLETION OF OVERHEAT CHECKLIST. FOUND THE P63B C/B OPEN RESET C/B. C/B STAYS SET, PERFORMED BITE CHK REF FIM 30 41 00 SYS CHK'S GOOD, ACFT OK FOR SVC.