As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
1.5 HOURS INTO FLIGHT, DESCENDING OUT OF FL 410, CREW SMELLED A STRONG ODOR SIMILAR TO THE BURNING OF ELECTRICAL INSULATION. INSPECTED AIRCRTAFT INTERIOR AND COCKPIT AREA, COULD NOT FIND SOURCE OF ODOR, ACCOMPLISHED OPERATIONAL CHECK FLIGHT COULD NOT DUPLICATE WRITE UP.