What was found
EMERG EXIT DOOR: REPEAT WRITE UP. AFTER TAKEOFF DURING INITIAL CLIMB, EMERGENCY EXIT MADE LOUD HISSING, BUZZING, HORN SOUNDING NOISES. NOISE WENT AWAY AFTER WE CLIMBED THROUGH ABOUT 15,000 FEET. GAINED ACCESS LO OVER-WING EMERGENCY EXIT DOOR LO LUBRICATE THE SEAL. UPON REMOVAL OF THE OVER-WING EMERGENCY EXIT DOOR WE DISCOVERED THE SEAL HAS MULTIPLE CUTS AND NEEDS REPLACEMENT. RESEARCHED AIPC. CONTACTED MCC AND PLACED DOOR SEAL PN: GM329-3006-1 ON ORDER. REINSTALLED OVER-WING EMERGENCY EXIT DOOR WHILE WE WAIT FOR PARTS. WORK PERFORMED IAW AMM 52-21-00.