As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REFERENCE LTPR NR 5001326202-0020 AIRCRAFT WAS NOT GROUNDED AND IS IN CHECK FOR SCHEDULED MX. DURING INCOMING CHECKS ON CAPACITY TEST FOUND EPSU BATTERIES 12 WL AND 13WL INOP REPLACEMENT REQUIRED IAW AMM 33-51-38-04 REV 98. REPLACED EPSU BATTERY AND POWER SUPPLY 12WL AND 13WL IAW AMM 33-51-38-04 CONF 00 REV. 98. MX ACTION IS ACCEPTABLE.