As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING POWER ON CHECKLIST EMER LIGHTS WOULD NOT TEST. WE DID THE AFM PROCEDURE FOR CHARGING THE BATTERIES. AFTER COMPLETED THE EMER LIGHTS WOULD WORK WITH THE SWITCH IN THE ON POSITION BUT NOT IN THE ARM POSITION. REMOVED SUSPECT #1 EMERGENCY BATTERY AND INSTALLED AN REPAIRED BATTERY, COMPLETE OPS CHECKS WITH NO DEFECTS NOTED, ALL WORK ACCOMPLISHED IAW AMM 33-50-06