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 AT HIGH POWER SETTINGS. COCKPIT TO ATC AND PILOT TO PILOT COMMUNICATIONS WERE AFFECTED. ACFT GROUNDED. DIVERTED, RAN ENGINES AT HIGH POWER SETTINGS IAW AMM 71-00-00, NO AIR NOISE NOTED. ACCOMPLISHED ON TSR 818575. FOUND Y HOSE SEVERED.