As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT NOT GROUNDED. 10WL FAILED EPSU BATTERY CAPACITY TEST AND 11WL FAILED EPSU BATTERY TEST. R & R 10WL EPSU IAW AMM 33-51-38-000-001-A AND AMM 33-51-38-400-002-A. R & R 11WL EPSU IAW AMM 33-51-38-000-001-A AND AMM 33-51-38-400-002-A.