As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C IN FOR A 3A INSPECTION AND WE FOUND THE NR 1 EMERGEENCY CEILING LIGHT FLASH ON AND OFF. MAINTENANCE REMOVED AND REPLACED THE NR 1 BATTERY TRAY IAW AMM 33-50-04. OPS CHECK GOOD. IPC REFERENCE IPC 33-50-04 FIG 01A ITEM 50. A/C RELEASED TO SERVICE.