As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL330 HEARD A LOUD NOISE FROM BELOW. AFTER THAT SMELLED A BURNING ODOR. FA SMELLED THE SAME. DIVERTED. USED OXYGEN. BLOWER FAN CHECKED. TROUBLESHOT IAW TSM 21-26-00-810-809. R & R THE AVIONICS VENT BLOWER FAN IAW AMM 21-26-51, OPS CHECKED GOOD.