What was found
*EMERGENCY A/R* EXTREME LOUD NOISE FROM DOOR 4R WHILE AT 17000FT CABIN PRESSURE INDICATI ONS WERE NORMAL CREW DEBRIEF: CREW ADVISED LOUD HISSING NOISE COMING FROM THE 4R SERVICE DOOR WITH NO PRESSURE LOSS FLYING THROUGH 17,000 FEET. UPON INITIAL INSPECTION OF 4R SERVICE DOOR. WE WERE ABLE TO SEE DAYLIGHT FROM THE UPPER DOOR GATE, EXTENDING ALL THE WAY FROM LEFT TO RIGHT. WHEN WE OPEN THE DOOR APPROXIMATE 12 TO 15 INCHES OF SEAL DISLODGE FROM THE TRACK AND WAS HANGING DOWN. ALSO NOTICED THE SEAL TRACK WAS DAMAGED IN SEVERAL PLACES UNABLE TO CONTAIN THE SEAL IN IRS PROPER POSITION. PERFORMED CABIN PRESSURE LEAK TEST IAW AMM 05-51-24-702-001. FOUND NO HISSING OR LOUD NOISE COMING FROM 4R WHEN PRESSURIZED. LEAK CHECK PASSED. FOLLOWED ECRA 5210-02548 FOR DOOR GAP AND FLUSHNESS. NO FINDINGS NOTED. REPAIRED COSMETIC SEAL BACK IN DOOR TRACKS GOOD TO CONT