What was found
FLIGHT DECK OVERHEAD EMERGENCY LIGHT ON W/ AIRCRAFT POWERED DOWN AND EMER LT SWITCH IN OFF POSITION. REMOVED FROM SERVICE. REMOVED AND REPLACED #1 ELPU "BOX ONLY" PER E175 AMM TASK 33-50-01-000-801-A AND 33-50-01-400-801-A AND MCN NO: E33033-01 ISSUE NO: 1. NO HELP. INTERROGATED CMC FOUND FAULT 35500001UT1 AND 33500004UT1. EXECUTED E175 FIM 33-50-00-810-801-A THROUGH SUBTASK 33-50-00-813-004-A AND E175 FIM 33-50-00-810-804-A THROUGH SUBTASK 33-50-00-813-047-A. NO HELP. REMOVED AND REPLACED ELPU 1 BATTERY PACK AS PRECAUTIONARY MEASURE IAW E175 AMM 33-50-01-000/400-802-A. OPS TEST GOOD. ALL EMERGENCY LIGHTS CONFIRMED OFF WITH AIRCRAFT POWERED DOWN AND EMER LT SWITCH SET TO OFF. ACFT OK FOR SERVICE.