As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN CRUISE FLIGHT RETURNING TO BASE FROM AN INTERFACILITY TRANSFER, BURNING/OVERHEATED ELECTRICAL INSULATION COULD BE SMELLED IN THE COCKPIT. AS SOON AS THE SMELL APPEARED IT WENT AWAY. CONTINUED TO BASE 10 MIN AWAY AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AIRCRAFT ISSUE COULD NOT BE DUPLICATED AND NO DISCREPANCY WAS FOUND. AIRCRAFT WAS RETURNED TO SERVICE.