As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXCESSIVE AIR NOISE IN COCKPIT. CABIN CEILING PANELS ARE REMOVED. CLEANED DISTRIBUTION DUCT FOR EACH OUTLET FROM FIRST TO SEAT ROW 18A-F. CONTINUED ON THROUGH ROW 18. WILL REPLACE FLOW CONTROL VALVE. THEN OPS CHKS AND CABIN RESTORE TO FOLLOW. CLEANING ACCOMPLISHED. OKAY FOR SERVICE.