As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(SUPPORT TASK) THE EMERGENCY LIGHT TEST AT THE PTP FAILS WITH TH E MESSAGE ''EPSU BATTERY AFT L?. REFER TO N/R: 9303386. REMOVED AND REPLACED BATTERY & EPSU 13WL AFL LECT. IAW AMM 33-51-38-000-002-A AND 33-51-38-400-002-A. OPERATIONAL TEST GOOD IAW AMM SUBTASK 33-51-38-710-052-B. DATA WAS TRANSCRIBED FROM PAPER DOCUMENT N/R: 9303386.