As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BGR/BOS - FLT 4589 - A STRONG BURNING ODOR WAS NOTED BY THE FLIGHT CREW WHICH SUBSIDED WHEN THE RIGHT BLEED WAS CLOSED. NO OTHER WARNINGS WERE RECEIVED, AND THE AIRCRAFT LANDED WITHOUT INCIDENT IN BOS. MAINTENANCE WAS DISPATCHED TO THE AIRCRAFT AND FOUND THE RIGHT INTAKE DUCT WITH A LARGE BURN AREA. MAINTENANCE REMOVED AND REPLACED THE LOWER DUCT AND RETURNED THE AIRCRAFT TO SERVICE. (X)