As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITHIN A FEW MINUTES DURING CRUISE AT FL 370, A VIBRATION AND DULL NOISE BEGAN. IT WAS SHORTLY FOLLOWED WITH A METAL BURNING ODOR. RECEIVED A VENT EXTRACT FAULT. EXTRACT WAS SET TO OVERRIDE, DIVERTED AND LANDED. PERFORMED CABIN ODOR OR SMOKE INSPECTION IAW AMM 05-50-810-831-A. CONFIRMED EXTRACT FAN AT FAULT. R & R EXTRACT FAN 18HQ IAW AMM 21-26-51. NO LEAKS NOTED.