As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3321, CREW REPORTED SEVERAL EMERGENCY LIGHTS INOPERATIVE. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED ALL 4 BATTERY PACKS PER AMM 33-50-04. OPERATIONAL CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. PARTS CHANGED WERE: BATT PACK NR 1 P/N- 20131A S/N- 104885 BATT PACK NR 2 P/N- 20131A S/N 103857, BATT PACK NR 3 P/N 20131A S/N - 103140 BATT PACK NR P/N-20131A, S/N- 101798.