As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT 3055, 1L & 1R EMERGENCY LIGHT FLASH ON & OFF DURING T/O ROLL. CORRECTIVE ACTION: REPLACED RELAY 8WL PER IPC 33-51-88-02. GOT CLASS 3 EPSU MSG WHEN BITE TEST ON EPSU PER A321 AMM 33-51. FOUND LOW BAT FAULT. REPLACED 10W EPSU BAT PER A321 AMM 33-51. (LP 6355225)