What was found
CREW SMELLED ODOR SIMULAR TO ELECTRICAL BURNING IN CABIN, WHILE CABIN HEATING WAS OPERATING AT LEVEL OFF CRUISE. FLIGHT CANCELLED WITH LANDING MADE AT NEAREST SUITABLE LANDING AREA. CABIN HEATING SYSTEM SWITCHED OFF WHILE AIRCRAFT WAS LANDED TO NEAREST SAFE LANDING AREA, ODOR BEGAN TO DISIPATE DURING MANUVER TO LAND. NORMAL SHUTDOWN, UNEVENTFUL LANDING. COULD NOT DUPLICATE DISCREPANCY.