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 OPS CHK, FOUND EPSU BATTERY 10WL INOPERATIVE. REPLACEMENT REQUIRED IAW AMM 33-51-38-400-002-A REV. 103. REPLACED EPSU BATTERY 10WL IAW AMM 33-51-38-400-002-A REV 103. MX ACTION IS ACCEPTABLE.