As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - EMERGENCY EXIT LIGHTS ON SEATS FLASH INTERMITTENTLY IN FLIGHT. REPLACED TRACK LIGHTING BATTERY PACKS AT OVERHEAD PANEL ABOVE AFT SERVICE DOOR AND BOTH BATTERY PACKS AT OVERHEAD PANEL ABOVE SEAT 20DEF. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)