As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ENGINE SLOW TO SPOOL UP ON TAKEOFF. AT ALTITUDE ROLL BACK OF 20 PERCENT OCCURRED AND RUMBLE NOISE HEARD. PRECAUTIONARY ENGINE SHUTDOWN WAS CARRIED OUT. POST FLIGHT CORRECTIVE ACTION WAS REPLACEMENT OF THE ENGINE FUEL CONTROL UNIT. THE ENGINE WAS RUN UP SERVICEABLE AND THE AIRCRAFT RETURNED TO SERVICE.