As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EPSU BATTERY (12WL) FAILED ON EMERGENCY LIGHTNING BATTERY CAPACITY TEST AND REQUIRE REPLACEMNT. LTPR NR#5001250432-0010. BATTERY REPLACEMENT OF (12WL) PERFORMED IAW AMM:33-51-38-000-002 REV 120 & AMM:33-51-38-400-002 REV 120. TEST SATIRFACTORY. REMOVE PART INFO: P/N:AD-3214-31, S/N:292049, INSTALL PART INFO: P/N:AD-3214-31 S/N:315319. RECORDED ON LTPR NR#5001250432-0010.