As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT WE NOTICED THE EMER LIGHTS WERE ILLUMINATED, THE SWITCH WAS IN THE ARM NOT ON POSITION. REPLACED EMERGENCY BATTERY. PERFORMED CHARGE AND OPS CHECK OF BATTERY. OPS CHECK GOOD ALL WORK PERFORMED IN REF TO EMB 505AMM 32-52-00, 32-52-01