As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS FUMES IN COCKPIT AND FWD PART OF CABIN INTERMITTANTLY FOLLOWED BY 'L RECIRCULATION FAN' EICAS MESSAGE. CREW SELECTED L RECIRCULATION FAN TO OFF AND NOW FUMES HAVE DISSIPATED. INSPECTED FAN AND FOUND STRANGE NOISE. REMOVED & REPLACED HANDSET AT 1L, OPS CHECKED GOOD.