As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER LEVELING OFF AT FL410 WE STARTED NOTICING WHAT WE THOUGHT WAS A STRONG ODOR. PAX ALSO NOTICED THE ODOR THROUGHOUT THE CABIN . A FEW MINUTES LATER THE FMS SCREEN WENT BLANK AND WAS VERY HOT TO TOUCH. ABOUT ONE MINUTE LATER WE NOTICED A FEW SMALL PUFFS OF SMOKE COME FROM THE TOP OF THE FMS. REPLACED DEFECTIVE FMS WITH ANOTHER UNIT. INSTALLATION IAW MM 34-61-03 RAN ACFT & SYSTEM'S FOR ONE HR WITH NO SMOKE ISSUES.