As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:NACLIMBING OUT OF FL200 A VERY LOUD HISSING SOUND CAME FROM NEAR FWD ENTRY DOOR. SOUND REMAINED CONSTANT. NO PRESSURIZATION ISSUES NOTED.FOUND DOOR SEAL OF FWD ENTRY DOOR SEPARATING FROM RETAINER GROOVE AT BOTTOM OF FWD ENTRY DOOR. REINSTALLED SEPARATED SECTION OF DOOR SEAL IAW AMM 52-09-01-401. LEAK CHECK GOOD. A/C OK TO CONTINUE. NO HISTORY FOUND IMPACTS WITHIN 180 DAYS