As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 4001 - THREE BULBS INOP ON EMERGENCY FLOOR STRIP LIGHTING IN MIDDLE OF CABIN WITH AIRCRAFT POWERED DOWN. REMOVED AND REPLACED 18WL POWER SUPPLY IAW ATR WM33-57-00. OPS CHECK OF LIGHT GOOD. AIRCRAFT WAS RETURNED TO SERVICE. (M)