As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: EPL BATTERY AT WBU20 S/N ST24093357 BAD FROM STOCK. SEAT ROW 26HED. MAINTENANCE REMOVED AND REPLACED EPL BATTERY AT WBU20, REMOVED WBU=S/N ST24093357 REPLACED WBU=S/N ST25016772. INSTALLATION TESTS GOOD, OK FOR SERVICE IAW AMM 33-51-07.