As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXCESSIVE COCKPIT AIRFLOW NOISE OVERHEAD PANELS INTERFERES WITH VOICE COMM BETWEEN PILOTS. ACP SERVICE TIP AMM 21-22 -00 TO STEP 8. FOUND AIRFLOW TO BE HIGH AT 3800 FPM & CFM AT 380. TOTAL NOISE WITH RT RECIRCULATING OFF IS BELOW 70.5DB. NEEDS AIR DUCT CLEANING. CLEAN AIR DIST DUCTS IN THE CABIN & COCKPIT.