As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 9730 - EMERGENCY EXIT LIGHTING SYSTEM BULBS EXTINGUISHING IN MULTIPLE RANDOM AREAS AFTER 10-30 SECONDS. MAINTENANCE REMOVED AND REPLACED EMERGENCY POWER PACKS AT 21LN S/N 19193, 20LN S/N 19342, 22LN S/N 17164, 23LN S/N 15481 AND 24LN S/N 18083. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)