As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
POWER ROLL BACK DURING CRUISE AT FL410, LOUD NOISES SOUNDING LIKE COMPRESSOR STALLS WERE HEAR FOR APPROX 10 SEC. AFTER WHICH THE ENG POWER ROLLED BACK TO IDLE. THE FLIGHT WAS DIVERTED AND LANDED SAFELY. TROUBLESHOOTING IS ON-GOING. (SDR 2011020500132/DXTA2011010604399)