As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT, EMERGENCY LIGHTS CAME ON IN CABIN, TROUBLESHOT W/ MAINTENANCE, NO CHANGE. STAYED ON FOR 20 MINUTES THEN WENT OUT WHEN ACFT ENCOUNTED LIGHT NB. SENSOR, TS IAW FIM 33-51. R & R EMERGENCY LIGHT CHARGER M730 & BATTERY PACK. OPS CKS OK.