As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING DESCENT, POWER WAS ADDED, BUT RIGHT ENGINE WOULD ONLY PRODUCE 1150 TO 1250 FEET/POUNDS OF TORQUE. AIRCRAFT LANDED OK. GROUND RUN DID SAME, BUT AFTER 5 TO 10 SECONDS THE TORQUE JUMPED TO 2206 FEET/POUNDS. EVENTUALLY RIGHT FCU WAS REPLACED.