As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CRUISE, THE ENGINE EMITTED A LOUD NOISE ACCOMPANIED BY FLAMES FROM THE EXHAUST AND POWER FLUCTUATIONS. THE PILOT REDUCED ENGINE POWER AND ACCOMPLISHED AN UNSCHEDULED LANDING. SUBSEQUENT INSPECTION FOUND THE ENGINE COMPRESSOR BLEED VALVE TO BE STIFF AND FULL OF SAND, THE BOV WAS CLEANED AND THE ENGINE RAN NORMALLY. (TC# 20060704019)