As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CLUTCH) DURING CRUISE FLIGHT NR 1 ENGINE NR 2 WERE NORMAL. NR 1 TORQUE DROPPED TO 25 PERCENT. RESIDUAL TORQUE REMAINED AS NR 1 WAS BROUGHT TO IDLE. NR 1 ENGINE SECURED TO IDLE, RUN ON LANDING PERFORMED TO CGI. DURING TROUBLESHOOTING OF AIRCRAFT, REMOVED NR 1 CLUTCH. FOUND SPRAGS DISCOLORED, (BLUE TINT). INSTALLED SERVICEABLE CLUTCH, PERFORMED GROUND RUN AND MAINTENANCE CHECK FLIGHT. AIRCRAFT WAS RETURNED TO SERVICE.