As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTING: DURING THE EMER LIGHTS TEST (BATT OFF W/EMET LTS SW ARM), THE AFT EMER LIGHTS ARE INOP. THE FWD EMER LTS ARE OPERATIVE. // SIGNOFF// REMOVED #4 AFT EMERGENCY BATTERY PACK PN CBS28-1 SN 170SM DUE TO INOP. INSTALLED REPAIRED CUSTOMER SUPPLIED #4 AFT EMERGENCY BATTERY PACK PN CBS28-1 SN 7183M. PERFORMED OPS CHECK , CHECKS GOOD. ALL WORK PERFORMED IAW 680A AMM 33-50-06.