As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT TO OFFSHORE PLATFORM, PILOT NOTICED TORQUE INDICATOR FLUCTUATIONS, WITH NO ASSOCIATED ENGINE SURGING OR FLUCTUATIONS. LANDING TO PLATFORM WAS NORMAL. TROUBLESHOOTING REVEALED TORQUE OUTPUT WITHIN ENGINE GEARBOX HAD FAILED. ENGINE GEARBOX WAS CHANGED AT PLATFORM LOCATION. ALL ENGINE PARAMETERS WERE NORMAL AFTER GEARBOX CHANGE. ACFT WAS RETURNED TO SERVICE.