What was found
(CAN) IN CLIMB TO FL 240, A LOUD NOISE COMING FROM THE PAX DOOR WAS HEARD ALONG WITH A DEPRESSURIZATION OF THE AIRCRAFT OF APPROXIMATELY -4000 FT/MIN (ON EICAS). THE FLIGHT CREW DID AN EMERGENCY DESCENT PER THE QRH AND LANDED AT THE DESTINATION AIRPORT. ONCE AT AIRPORT, IT WAS OBSERVED THAT THE PAX DOOR SEAL WAS DE BONDED ON A LENGTH OF APPROXIMATLY 1.5 METER AND THAT A PIECE OF 30 CM WAS MISSING.THE AIRCRAFT WAS FERRIED, UNPRESSURIZED, WHERE THE SEAL WAS REPLACED.