What was found
UPON CLIMB OUT THE CABIN WAS NOT PRESSURIZING (REPEAT WRITE UP) AND THERE WAS SIGNIFICANT AIRFLOW THRU THE MAIN CABIN DOOR. AFTER WE LEVELED AT 5000FT FOR AWHILE THE DOOR SEAL AIRFLOW DECREASED AND THE CABIN BEGAN TO PRESSURIZE. WHILE PERFORMING OTHER MAINTENANCE TECHS FOUND THE MAIN CABIN DOOR HANDLE WOULD NOT SEAT IN CLOSED POSITION ATTEMPTED TO CLOSE MAIN CABIN FROM INSIDE & OUTSIDE ACFT MULTIPLE TIMES WITH NO SUCCESS. CLEANED & LUBRICATED EXTERIOR PORTION OF HANDLE ASSEMBLY UNTIL HANDLE SEATED CORRECTLY. OPS CHECK GOOD. IAW AMM 12-20-04.