What was found
CABIN EMERG LIGHT: DURING CRUISE FLIGHT, CABIN EMERGENCY LIGHTS BEGAN TO FLICKER ON AND OFF, THEN SHORTLY AFTER, ILLUMINATED STEADY ON WITH THE EMER LT SWITCH IN THE ARM POSITION. CORRECTIVE ACTION: REPLACED BATTERY. OPS CHECK GOOD. IAW EMBRAER PHENOM 300 AMM 33-52-01.