As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING CARD A332204-02 ON THE A6 CHECK THE POWER SUPPLY UNIT, 10 WL BATTERY FAILED THE CAPACITY TEST. ACFT OUT OF SERVICE. POWER SUPPLY UNIT BATTERY REPLACED IAW AMM 33-S1-38-000-002A AND 33-S1-38-400-002A. TESTED GOOD. ACFT RETURNED TO SERVICE.