As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 4031 - EMERGENCY FLOOR LIGHT SYSTEM STAYS ON WHEN AIRCRAFT POWER IS REMOVED AFTER TESTING THE FLOOR LIGHT SYSTEM. REPLACED EMERGENCY LIGHT BATTERY PACK 3WL. OPS CHECK PERFORMED WITH NO DISCREPANCIES NOTED. AIRCRAFT WAS RETURNED TO SERVICE. (X)