As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 4292 - AFTER TAKEOFF, THE RIGHT ENGINE TORQUE AND PROP SPEED STARTED FLUCTUATION. AIRCRAFT RETURNED TO BOS. MAINTENANCE REPLACED THE RIGHT NP SENSOR. ENGINE GROUND RAN WITH NO PROBLEMS FOUND. AIRCRAFT RETURNED TO SERVICE. (M)