As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PERFORMANCE OF TASK CARD 527100-04-1 (6) / FNC DOOR AND ESCAPE SLIDE CONTROL, REMOVE BATTERY OF AUTONOMOUS STANDBY POWER SUPPLY UNIT (ASPSU) FOR IN-SHOP BATTERY CAPACITY CHECK, ASPSU #1 BATTERY P/N 3214-31 S/N 862710 FOUND FAULTY DURING BITE TEST. REPLACED BATTERY IAW AIRBUS AMM 52-71-36-04 REV 20 PERFORMED, SATIS.