What was found
AIRCRAFT WAS GROUNDED: 2 RECESSED EMERGENCY LIGHTS REMAIN ON CONTINUOUSLY WITH SWITCHES ARMED. 1 LOCATED IN FIRST CLASS THE OTHER IN COACH. MAINTENANCE REPLACED THE BATTERY FOR EMERGENCY POWER SUPPLY UNIT 13WL DUE TO FAULT MESSAGES PER AMM 33-51-38. MAINTENANCE ALSO REPLACED EMERGENCY POWER SUPPLY UNIT 15WL PER AMM 33-51-38. (AALA202607062622). A SATISFACTORY OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM WAS ACCOMPLISHED WITH NO ISSUES NOTED.