As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, A BURNING SMELL WAS NOTICED IN THE FLIGHT DECK ALONG WITH A LOW FREQUENCY VIBRATION. SECURED ZONE 1 RECIRCULATION FAN AND ODOR AND VIBRATION STOPPED. AIRCRAFT CONTINUED TO DESTINATION AND LANDED WITHOUT INCIDENT. REPLACED THE RECIRCULATION FAN, OPERATIONAL CHECK GOOD.