As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BLEED AIR NOISE IN COCKPIT REACHES 78.3 DB AT CLIMB POWER. COULD NOT DUPLICATE ON GROUND. OPS CHECK OF PACK SYSTEM GOOD IAW AMM 21-51-00. T/S FLIGHT DECK BLEED AIR NOISE IAW AMM 21-22-00. NO DEFECTS NOTED. RAN RH ENGINE TO TRY TO DUPLICATE THE NOISE IAW AMM 71-00-00. FLT DECK NOISE WITH PACKS ON WAS NORMAL.