What was found
FLIGHT 7722 ORF TO IAD - WHILE IN CRUISE THE CREW SMELLED SOMETHING BURNING, THEN RECEIVE A PACK 2 FAIL MESSAGE. THE CREW TURNED OFF PACK 2, COMPLETED PACK 2, FAIL CHECKLIST IN THE QRH, TURNED PACK 2 OFF AND THE ODOR DISSIPATED. CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. CFR CONFIRMED THERE WAS NO FIRE OR SMOKE COMING FROM THE AIRCRAFT. MAINT INSPECTED PACK 2 AREA NO FURTHER DEFECTS NOTED. MEL'D PACK 2. REMAINS ON MEL THIS DATE WITH NO OTHER CORRECTIVE ACTION TAKEN.