As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR NOISE IN THE COCKPIT IS LOUD. CFM IS 380 (SHOULD BE 375 OR LESS) AND FPM IS 4380 (SHOULD BE 3430 OR LESS). AIR CONDITIONING OUTLET DUCTS REQUIRE CLEANING. ONLY 8DB DIFFERENCE WHEN USING JUST 1 PACK. REPLACED LT FLOW CONTROL VALVE. BOTH ENGINES IDLE AND PACKS RUNNING COCKPIT 75 DB. BOTH ENGINE 1.4 EPR AND PACKS ON COCKPIT 80 DB. 1 DB DIFF WITH RT RECIRC ON. FWD LAV 77 DB. REPLACED LT PACK FLOW CONTROL VALVE.