As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED AND IS IN CHECK FOR SCHEDULED MX. DURING OPC FOUND EPSU BATTERY 15WL INOP REPLACEMENT REQUIRED IAW AMM 33-51-38-400-002-A REV 103. : REPLACED EPSU BATTERY 15WL IAW AMM 33-51-38-400-002-A REV 103. MX ACTION IS ACCEPTABLE.