What was found
FORWARD THREE CEILING OVERHEAD EMER LIGHTS & L1 EXIT LIGHT WILL NOT ILLUMINATE. REMOVED FROM SERVICE. CMC SHOWING THE FOLLOWING RELATED FAULT: "EMER LT BATT (FWD L)" 33500002VT1. C/W RESETS PER FIM 33-50-00-810-802-A00, NO HELP. REMOVED AND REPLACED LH FWD EMER LIGHT POWER UNIT BATTERY, REF AMM TASKS 33-50-01-000/400-802-A, OPS TEST GOOD, ALL EMER LIGHTS NOW COME ON. FAULT NO LONGER NOTED. AIRCRAFT RETURNED TO SERVICE.