As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE LEFT ENTRY DOOR HAD VERY LOUD HISSING SOUND WHICH DISSIPATED BY TOP OF CLIMB. FOUND 12 INCHES OF SEAL PULLED OUT OF MCD INSTALLED THE SEAL. PERFORMED PRESSURIZATION OF ACFT, NO NOISE NOTED OK FOR SERVICE IAW MM 21-00-00.