What was found
UPON CLIMBING THROUGH FL310, WE HEARD LOUD WHISTLE FROM MAIN CABIN DOOR. THERE WAS NO LOSS OF CABIN PRESSURE AND THE PRESSURE DIFFERENTIAL REMAINED AT 7.5 PSI AND 4,000 CABIN ALTITUDE. PERFORMED CABIN PRESSURIZATION LEAK CHECK IAW AMM 21-30-TWO AREA THAT REQUIRED CLEANING AND SEALANT APPLIED AND DOOR SEAL ADJUSTMENT. PERFORMED REQUIRED CLEANING AND SEALANT APPLIED AND DOOR SEAL ADJUSTMENT. PERFORMED PRESSURIZATION TEST 3X.THE 2ND AND 3RD TIME TESTING RESULTS, PRODUCED NO NOISE IN CABIN AND THE DEFFERENTIALL PRESSURE WAS AT8.35. OK FOR SERVICE