As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2152 AT CRUISE AT 18000 FT, THE TORQUE ON THE NR 1 ENGINE BECAME ERRATIC TORQUE WAS VARYING 3% OR SO. THE FUEL FLOW WOULD FLUCTUATE FROM 660 TO 715 NH VARIED ABOUT 1-2% THERE WAS A NOTABLE CHANGE IN SOUND OF THE PROP. MAINTENANCE REPLACED NR 1 MFC, COMPLIED WITH ENGINE RIGGING CHECKS. GROUND RAN ENGINE RUNS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.