What was found
(CAN) WHILE IN CRUISE FLIGHT, PILOT NOTICED INCREASED RPM AND VIBRATION. PILOT DECREASED RMP AND CARRIED OUT A PRECAUTIONARY LANDING. PROPELLER TECH HISTORY, PROPELLER O/H 21-FEB-11 -AT 1.3 TSO PROPELLER BLADES REPAINTED DUE TO POOR ADHESION -AT 36.1 TSO ACFT INSPECTED FOR 10 HR EXTENSION 45.1 TSO CHECK A C/O BY 138.4 TSO CHECK A C/O BY AT 166.0 TSO NEW PROP SHAFT SEAL INSTALLED AT 248.2 TSO 100 HR INSPECTION C/O 358.2 TSO CHECK A C/O AT 365.0 TSO PROPELLOR DISMANTLED, BLADES STRIPPED AND REPAINTED. PROPELLER RE-ASSEMBLED AND BALANCED -AT 376.3 TSO CHECK A C/O AT 425.1 TSO PROPELLER BALANCE CARRIED OUT TO 0.6 IPS, 50 HR EOC INSPECTION C/O AT 461.3 TSO PROPELLER REMOVED AND FWD TO O/L SHOP. PROPELLER PARTIALLY DISASSEMBLED TO INVESTIGATE SNAP RING FAILURE. MECHANICAL DAMAGE WITHIN ALLOWANCE. SNAP RING REPLACED. NO DAMAGE FOUND IN HUB. LINK BLOCKS REPLACED. REDUCED SHIMS IN ALL 3 BLADES. LOOKED FOR BIRD STRIKE DAMAGE, FOUND NONE. UPON REINSTALLATION OF PROPELLER, ISSUES DISCOVERED WITH PROPELLOR CONTROL. REPLACEMENT GOVERNOR TO BE INSTALLED FOR FURTHER TROUBLESHOOT. INVESTIGATION CONTINUING. WILL UPDATE WHEN AVAILABLE.