As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROXIMATELY 38 MINUTES INTO FLIGHT, AT FL410, HEARD A MODERATELY LOUD BOOM NOISE COMING FROM THE BACK LEFT SIDE OF THE AIRCRAFT, FELT A MINOR YAW MOMENT AND OBSERVED THE LEFT ENGINE STACK INCREASE SLIGHTLY THEN RETURN TO NORMAL. FLIGHT CONTINUED WITH NO FURTHER ANOMALIES.