As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, CREW REPORTS HEARING EXCESSIVE NOISE UNDER COCKPIT FLOOR & SMELLED HOT SMELL. FOLLOWED QRH PROCEDURES & TURNED VENT BLOWER OFF & AS SOON AS BLOWER WAS SWITCHED OFF NOISE STOPPED & ODOR BEGAN TO DISSIPATE. R & R AVIONICS FAN 20 HQ IAW AMM 21-26-51-400-001, OPERATIONS CHECKED GOOD.