As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(SUPPLEMENTAL MRR) PILOT REPORTED BURNING ELECTRICAL SMELL IN FLIGHT DECK. FLIGHT CREW DONNED OXYGEN MASK AND PERFORMED PACK SMOKE CHECK LIST. DECLARED EMERGENCY AND LANDED WITHOUT INCIDENT. MECHANIC INFORMED FLIGHT CREW THAT THE RECIRC FAN MOTOR WAS BURNING/SMOKING. REPLACED RECIRC FAN PER MM 21-21-0. OPS CK GOOD.