As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AIRCRAFT NOT GROUNDED) BATTERY AT FIN 11WL FAILED EPSU TEST / R&R EPSU BATTERY AT FIN 11WL IAW AMM REF 33-51-38-000-002-A AND 33-51-38-400-002-A. OPS CHECK PERFORMED,OPS CHECK GOOD AT THIS TIME. PN REMOVED 3214-31 SN REMOVED 949391 PN INSTALLED 3214-31 SN INSTALLED 969100"