As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - EEL - DURING 4 DAY CHECK DISCOVERED EVERY OTHER EMERGENCY EXIT LIGHT ILLUMINATED IN FWD CABIN DURING EMERGENCY LIGHTS TEST. MAINTENANCE REMOVED AND REPLACED THE LT OVERWING EMERGENCY POWER SUPPLY UNIT (11WL). OPERATIONAL TESTS WERE GOOD.