As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERGENCY LIGHTING BATTERY CAPACITY OPERATIONAL CHECK EPSU BATTERY 1L WAS UNSATISFACTORY EPSU BATTERY REPLACED AS PER AMM 33-51-38-000-002-A AND INSTALLATION OF THE BATTERY OF THE EMERGENCY POWER SUPPLY UNIT (EPSU) A SPER AMM TASK 33-51-38-400-002-A0 TEST OK PARTS USED: 18-3351-3-0001,QTY :1