As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EPSU (10WL) FAILED ON CAPACITY TEST. REPLACEMENT REQUIRED. SDR REQUIRED.-VERIFIED NR # 5001251245-0010, REPLACEMENT OF EPSU BATTERY AND REPLACEMENT OF THE EPSU (10WL) ACCOMPLISHED AS PER TSM 33-51-00-810-829-A REV 78 OPERATIONAL TEST OK.