What was found
DURING FLIGHT SJ9404 FROM CHS TO HOW, NR 1 ENGINE RPM FLUXED AND DECAYING STEADILY WITH ENGINE TORQUE, TIT, AND FUEL FLOW INDICATIONS FOLLOWING. SHUT DOWN NR 1 ENGINE AND LANDED WITHOUT INCIDENT AT HOW. INSPECTED NR 1 ENGINE INTAKE AND EXHAUST, NO DEFECTS FOUND, VISUALLY AND OHM METER USED TO CHECK MAG PLUGS, ALL CHECKED GOOD. SUSPECT VALVE HOUSING FAULTY, REPLACED VALVE HOUSING, PERFORMED ENGINE RUN SYSTEM OPS CHECKED GOOD.