What was found
MAIN DOOR SEAL HOWLING LOUDLY, CLIMBIMG THRU 10,000 FT, ABOUT 4 PSI. DURING DESCENT, STOPPED HOWLING AT 2.3 PSI. DOOR HANDLE STIFF & DIFFICULT TO CLOSE, BOTH INSIDE & OUTSIDE, AS LATCHES BEGIN TO ENGAGE & GAP AT TOP OF DOOR IS MUCH LARGER THAN NORMAL AS HANDLE BECOMES STIFF. PERFORMED VISUAL INSPECTION OF DOOR & SEAL, NOTED SEAL NOT BONDED TO DOOR. REMOVED SEAL FROM LOWER SECTION. INSTALLED A NEW SEAL IAW AMM 52-10-20400-801-A. PERFORMED ENGINE GROUND RUN, PRESSURIZED CABIN & PERFORMED LEAK CHECK IAW AMM 21-3 L-00-860-803-A. NOTED DOOR LEAKING AT FWD & AFT UPPER COMERS. REMOVED SEAL, CLEANED, & INSTALLED DOOR SEAL IAW AMM 52-10-20400-801-A. OPS TESTED OK.