What was found
DURING TAKEOFF, A SOUND OF AIR COMING FROM DOOR. NO CABIN DOOR CASS , INSURED DOOR LEVER DOWN, & DOOR TIGHT. UNABLE TO GET DOOR TO SEAL. FOUND DOOR SEAL LOOSE FROM UPPER DOOR, SEAL ATTACH TORN. R & R PAX DOOR SEAL IAW AMM TASK 52-11-29-000-801 REV 38. INSTALLED NEW SEAL IAW AMM TASK 52-11-29-400-801 REV 38. C/W SEAL CONTACT TEST IAW AMM 52-11-29-400-801 REV 38, TESTED GOOD. C/W PRESSURE TEST OF ACFT IAW AMM TASK 21-00-00-862-805 REV 35. TESTED GOOD, NO LEAKS. REMOVED PANEL 141BL LT AFT LOWER NOSE BAY IAW AMM 52-45-01-000-801 REV 38, INSTALLED 141BL LT AFT NOSE PNL IAW AMM 52-45-01-400-801 REV 38. PERFORMED WEATHER LEAK TEST OF DOOR, NO LEAKS NOTED. PERFORMED IAW AMM TASK 52-11-29-400-801 REV 38.