What was found
ON DEPARTURE ABOUT 9000' THE FUSELAGE DOOR WARNING TURNED ON AND OFF 3 TIMES. THE TYPE 2/3 EMERGENCY EXIT WAS INDICATING OPEN . DOOR WAS SECURE INDICATIONS TURNED OFF AFTER ABOUT A MINUTE . RETURNED TO FIELD. REMOVED FROM SERVICE. INSPECTED EMERGENCY DOOR AND FOUND ICE BUILD UP AROUND THE SEAL. REMOVED ICE AND INSPECTED SEAL FOR ANY DAMAGE WITH NONE FOUND . PERFORMED OPERATIONAL TEST OF THE DOOR PROX SENSOR IAW AMM TASK 31-62-00-710-801 OPS CHECK GOOD NO DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.