As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING SMELL OF FUMES IN COCKPIT AREA, AT CRUISE FLIGHT ALTITUDE FL410 LASTED 1-2 MINUTES. REMOVED AFT LT WINDSHIELD HEAT EMI FILLER AND INSTALLED A NEW FILTER. PERFORMED A WINDSHIELD HEAT OPS CHECK. NO FURTHER ODORS OR DISCREPANCIES NOTED, IAW AMM CH 30-41-00.