As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING BITE OF EPSU SYSTEM REF AMM 33-51-00-710-001-A RECIEVED AN EPSU BATTERY AFT L MESSAGE REMOVED AND REPLACED THE AFT LEFT EPSU BATTERY REF AMM 33-51-38/401. OPS CHECK GOOD, FAULT IS NO LONGER PRESENT AND THE BITE TEST PASSES.