As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN DESCENDING THROUGH 12K FEET THE MAIN DOOR MAKES A LOUD NOISE. IT SEEMS TO STOP MAKING NOISE AT 3K FEET THERE IS NO PRESSURIZATION ISSUES. FABRICATED A SHIM. INSTALLED SHIM ON LOWER FORWARD MED SUPPORT ANGLE RADIUS IAW SRM 52-11-28. INSTALLED CUSTOMER SUPPLIED NEW SEAL TAW AMM 52-11-28, LEAK AND OPS CHECK GOOD. NO DEFECTS NOTED.