AN ATR42 ACR FLC FOUND THAT THE ACFT WOULD NOT PRESSURIZE AS THEY CLBED THROUGH 10000 FT. THE CAPT DETERMINED THAT THE R FORWARD EMER EXIT DOOR WAS NOT PROPERLY SEATED AND THE FLC DECIDED TO CONTINUE TO PWM AT 9000 FT. MECHS PROPERLY REINSTALLED THE DOOR.

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STARBOARD EMER EXIT WINDOW APPEARED NORMAL ON PREFLT. CLBING THROUGH 3000 FT PRESSURIZATION NORMAL; IE; CABIN ALT 0 FT. UPON CLBING THROUGH 10000 FT; CABIN ALT AT 10000 FT; DSNDED TO 9000 FT. FLT ATTENDANT CALLED COCKPIT SAYING THE EMER EXIT WAS VERY LOUD. VISUAL INSPECTION BY CAPT CONFIRMED EMER EXIT DOOR HAD SHIFTED. COMPLETED QUICK REF HANDBOOK ITEMS; UNEVENTFUL LNDG. MECHS ON GND REINSTALLED EMER EXIT DOOR AND THIS FIXED THE PROB. RECEIVED ACFT MIDDAY. UNKNOWN WHAT ACFT USED FOR PRIOR TO OUR FLT. SUPPLEMENTAL INFO FROM ACN 383003: CAPT INSPECTED WINDOW AND NOTIFIED MAINT; AND THE EXIT ROW WAS KEPT CLR OF PAX. WE ALSO KEPT THE SEATBELT SIGN ON AND COMPLETED THE FLT UNEVENTFULLY IN PORTLAND. A MECH INSPECTOR SAID THE WINDOW WAS NOT SEATED ALL THE WAY. CALLBACK CONVERSATION WITH RPTR ACN 383005 REVEALED THE FOLLOWING INFO: THE RPTR WAS THE FO ON AN ATR42 FLT FROM EWR TO PWM. HE SAID THAT DURING THE PREFLT HE CHKED THE EXIT DOORS AND THEY ALL APPEARED TO BE PROPERLY SEATED AND FLUSH WITH THE FUSELAGE. HE SAID THAT THIS IS A NORMAL CHK FOR THIS TYPE OF ACFT. AS THEY COMPLETED THEIR AFTER TKOF CHKLIST AT AROUND 3000 FT HE CHKED THAT THE ACFT WAS PRESSURIZING NORMALLY AND IT WAS; HE SAID; THE CABIN DIFFERENTIAL WAS STARTING TO RISE. HOWEVER; AS THEY CLBED THROUGH 10000 FT THE 'CABIN HIGH ALT' WARNING SOUNDED AND HE SAID THAT WHEN HE LOOKED AT THE CABIN ALT IT WAS AT 10000 FT AND CLBING. THE FLC IMMEDIATELY STARTED A DSCNT INFORMING N90; ACCORDING TO THE RPTR. THE CAPT WENT TO THE CABIN AFTER THE ATTENDANT INFORMED HIM OF 'AIR NOISE' AROUND THE R FORWARD EMER EXIT. THE FO SAID THAT THE CAPT TOLD HIM THAT THE DOOR WAS NOT SEATED AND WAS OBVIOUSLY LEAKING; BUT SEEMED TO BE STABILIZED AND HE PLANNED TO CONTINUE TO DEST WITH THE SEAT BELT SIGN 'ON' AND NO PAX IN THE SAME ROW AS THE SEAT. THE FLC INFORMED THE COMPANY. AFTER LNDG; THE RPTR INSPECTED THE DOOR. FROM THE OUTSIDE HE SAW THAT PART OF THE DOOR EDGE PROTRUDED APPROX 1 INCH. THE MECH WAS ABLE TO RESEAT THE DOOR SO THAT IT WAS FLUSH AGAIN AND IT WORKED NORMALLY THE REST OF THE DAY. THE FO SAID THAT HE SUSPECTS THAT EITHER MECHS HAD WORKED ON THE ACFT WITH THE DOOR OPEN OR EMER EXIT TRAINING HAD BEEN CONDUCTED ON THE ACFT BEFORE THE FLC HAD FLOWN IT. HOWEVER; THERE WERE NO ENTRIES IN THE ACFT LOGBOOK TO REFLECT THESE ACTIVITIES.