As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1899 - MKE-FNT - THE CREW NOTICED THE RT ENGINE TORQUE FLUCTUATING 300-400 LB FT. NOTIFIED ATC, RETURNED TO MKE. AFTER AN UNEVENTFUL LANDING WAS MADE. MAINTENANCE PERFORMED EXTENSIVE TROUBLESHOOTING THE PROBLEM WAS FOUND TO BE AN INTERMITTENT THROUGH VALVE. AFTER GROUND CHECK, THE AIRCRAFT WAS TEST FLOWN, AND THE ENGINE OPERATED SATISFACTORY. AIRCRAFT WAS RETURN TO SERVICE. (M)