What was found
(CAN) IN CRUISE, FLIGHT CREW OBSERVED NR 2 ENGINE PARAMETERS SLOWLY DROPPING. AT 12 PERCENT TORQUE, DECISION WAS TAKEN TO SHUTDOWN THE ENGINE AND DIVERT TO A NEARBY AIRPORT. AN EMERGENCY WAS DECLARED AND THE ACFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE WAS DISPATCHED ON SITE AND FOUND THE P3 PRESSURE SENSING TUBE CONNECTING THE HYDROMECHANICAL UNIT AND THE PROPELLER OVERSPEED GOVERNOR FRACTURE JUST BEHIND THE OVERSPEED GOVERNOR FITTING. THE TUBE WAS REPLACED AND ENGINE RUNS PERFORMED BEFORE RETURNING THE ACFT TO SERVICE. MAINTENANCE HISTORICAL REVIEW INDICATES THAT THE TUBE WAS REMOVED/INSTALLED FEW DAYS EARLIER DURING REPLACEMENT OF THE ENGINE FUEL PUMP. IT IS LIKELY THAT THE LINE WAS OVERSTRESSED DURING INSTALLATION.