As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN STATED ON THE MORNING PREFLIGHT THE EMERGENCY LIGHT WOULD FAILED TO ILLUMINATE. OAT 10 DEGREES F. HEATED CABIN WITH PORTABLE ELECTRICAL HEATERS AND RECHARGED EMERGENCY BATTERIES WITH APU GENERATION. AIRCRAFT DEPARTED WHEN THE EMERGENCY LIGHTS TESTED GOOD. THIS SDR IS BEING SUBMITTED PER 14 CFR 121.703 (17).