As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
METALLIC FUME SMELL IN COCKPIT AND CABIN W/ ENGINE BLEED. ACCORDING TO THE CREW THE SMELL WAS SLIGHT AT FIRST BUT GOT PROGRESSIVELY STRONGER AS THE FLIGHT WENT ON EVENTUALLY REQUIRING USE OF THE COCKPIT O2 MASKS. CREW CONTINUED TO DESTINATION SINCE IT WAS CLOSE BUT REMAINED ON O2 UNTIL LANDING. MX R2 RECIRC FAN FILTERS.