As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: WHILE PERFORMING EMERGENCY LIGHT OP TEST PER AMM 33-51-00-710-804-A, FORWARD ENTRYWAY EMERGENCY LIGHTS FLICKERED AND THEN WENT OUT. MAINTENANCE REPLACED BATTERY OF THE EMERGENCY POWER SUPPLY UNIT (EPSU) 10WL IAW A319 AMM 33-51-38.