As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY CABIN LIGHTS COME ON IN ARMED POSITION. BEGAN TROUBLE SHOOTING EMERGENCY CABIN LIGHTS, IAW FIM P-300 33-50-00 PAGE 3 BLOCK DIA 1 STEP 1 AND 2 FOUND EMERGENCY BATTERY 1 PACK TO FAIL. PERFORMED REPLACEMENT OF EMERGENCY BATTERY 1 WITH MODIFIED UNIT, IAW P 300 AMM 33-52-01. PERFORMED OPERATIONS CHECK TEST OF EMERGENCY LIGHTS, IAW R 300 AMM 33-52-00. NO DEFECTS NOTED EMERGENCY LIGHTS DO NOT COME ON IN ARMED POSITION.