As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PER 9617511 AND T/C 18-0550-1-0002 (SPEC A3NB-33-3-6012) CAB IN EMERGENCY LIGHT CHECK FROM PTP FAILS WITH MSG "EPSU BATT AFT L" AND "EPSU BATT EMER L" RESET EPSU BATT AFT L AND BATT EMER L IAW AMM 33-51-38-400- 001A, PERFORMED BITE TEST IAW AMM 33-51-38-400-001A NO DEFE CTS NOTED.