What was found
WITH EMERGENCY LIGHT SWITCH IN ARM POSITION, EMERGENCY LIGHTS ARE ILLUMINATED. CORRECTIVE ACTION: REMOVED FAILED FORWARD BATTERY PACK P/N 6450LS-00 S/N 002058 AND REPLACED WITH A MODIFIED BATTERY PACK P/N 6450LS-00 S/N 000869. REMOVED FAILED AFT BATTERY PACK P/N 6450LS-00 S/N 00846 AND REPLACED WITH A MODIFIED BATTERY PACK P/N 6450LS-00 S/N 000668. OPERATIONS CHECKED EMERGENCY EXIT LIGHTS NORMAL. ALL REF EMB 505 AMM 33-52-01.