What was found
FIVE MINUTES AFTER TAKEOFF, PILOT NOTICED OIL PRESSURE GAUGE FLUCTUATED FROM 60 PSI - 130 PSI AT A STEADY RATE. DURING A PRECAUTIONARY LANDING, THE TORQUE FLUCTUATED ABOUT 10 PERCENT. UPON INITIAL INVESTIGATION, THE OIL RESERVOIR WAS WAY DOWN AND THE EXHAUST COLLECTOR WAS VERY WET WITH OIL. SPECULATION - NR 6 AND NR 7 SCAVENGE STRUT BECAME PLUGGED AND THE PUMP FORCED OIL THROUGH SEAL INTO THE TURBINE AND PUMPED IT OVERBOARD. TURBINE ASSEMBLY WAS CHANGED.