As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COMPRESSOR STALL CAUSED OSCILLATIONS IN AIRFRAME. ENGINE POWER REDUCED TO IDLE. A SINGLE ENGINE LANDING CARRIED OUT IN NEAR BY FIELD. ENGINE REPLACED WITH SERVICEABLE UNIT. IT WAS FOUND TO BE A STUCK CLOSED, BLEEDVALVE AND 3RD STAGE COMPRESSOR BLADE DAMAGE.