What was found
FLT NR 9006 - SNN-YQX - NR 1 ENGINE RPM SLOWLY DECAYED TO 98 PERCENT WHILE SLAVING TO NR 2 ENGINE AS MASTER. WITH NO MASTER SELECTED, NR 1 PROP GOES TO 96.7 PERCENT. SHUT DOWN NR 1 ENGINE AND ACCOMPLISHED AIR TURN BACK TO SNN. FOUND NR 1 PROP VALVE HOUSING FAILED TO OPERATE NORMALLY. WITH EVIDENCE OF METAL SHAVING ON UNIT, PERFORMED THREE ENGINE FERRY FLIGHT TO CBG. REPLACED NR 1 PROP ASSEMBLY AND VALVE HOUSING, PERFORMED ENGINE RUN UP. OPS CHECKED GOOD PER MM CH 61. (M)