As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT WE HEARD AN UNUSUALLY LOUD HISSING NOISE COMING FROM THE MAIN CABIN DOOR. THE NOISE CHANGED IN PITCH AS THE CABIN DIFFERENTIAL CHANGED. NO PRESSURIZATION ISSUES WERE NOTED. INSTALLED NEW UPPER ACOUSTIC SEAL IAW AMM 52-10-04. OPS CHECK AND LEAK CHECK DOOR SEAL PERFORMED, NO DEFECTS NOTED. ALL WORK DONE IAW AMM 52-10-04, SRM 51-40-06.