What was found
WHEN PLANE IS POWERED IN EMERGENCY LIGHTS ARE ON THE ARM OR OFF POSITION. ALL EMERGENCY LIGHTS ARE OFF AS EXPECTED. WHEN THE APU IS SHUT DOWN THE FORWARD EMERGENCY LIGHTS ARE OUR RECEIVING POWER AND ON. THIS INCLUDES THE EXTERIOR EMERGENCY LIGHT TO THE RIGHT OF THE CABIN DOOR AS WELL AS THE OVERHEAD ENTRYWAY LIGHT. ALL OTHER EMERGENCY LIGHTS ARE OUT AS THEY SHOULD BE. CORRECTIVE ACTION: PERFORMED EMERGENCY LIGHT OPERATIONAL CHECK IAW GL-5500 AMM 33-51-00. FOUND THE / FORWARD EMRGENCY LIGHTS WOULD NOT COME ON. ALLOWED THE EMERGENCY BATTERIES TO CHARGE FOR 30 MINUTES AND PERFORMED OPS CHECK AGAIN. THE FORWARD EMERGENCY LIGHTS CAME ON FOR A COUPLE A SECONDS BEFORE EQTINGUISHING. REMOVED AND REPLACED ELPS 2. INTERNAL BATTERY IAW GL-5500 AMM 33-51-09. OPS CHECK GOOD.