As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMER LIGHTS FLASH CONTINUOUSLY IN ARM POSITION. PERFORMED T/SHOOTING FOUND AFT CABIN(LAV AREA) EMERGENCY BATTERY INOP, MCC REQUESTED TO R/R BOTH EMER. BATTERY. REMOVED ANO REPLACED FWD ANO AFT CABIN EMERGENCY BATTERY WITH CUSTOMER SUPPLIED NEW PARTS, PERFORMED SATISFACTORY OPERATIONAL TEST OF EMERGENCV LIGHTS LAW AMM 33-52-01