What was found
DEPARTED, 10 MINUTES INTO FLIGHT AT 1000 FT AGL AND CRUISE POWER, FLIGHT CONTROLS STARTED TO TIGHTEN UP. SLOWED AC AND SUSPECTED HYDRAULIC FAILURE. PULLED HYDRAULIC C/B, POWER DID NOT RESTORE PUSHED THE C/B BACK IN. TURNED OFF THE HYDRAULIC CONTROL SWITCH. AC WAS FLYING GOOD, ELECTED TO FLY THE AC TO DESTINATION. MAINT REMOVE HYDRAULIC PUMP, FOUND WORN SPLINES AND SHAFT WAS LOCKED INTO THE TACH GENERATOR SO REPLACED TACH GENERATOR AND HYDRAULIC PUMP. REMOVED AND REPLACED HYDRAULIC FILTERS, FLUSHED LINES AND RESERVOIR AND RESERVICED HYDRAULIC SYSTEM. COMPLIED WITH GROUND RUN, LEAK CHECK OF HYDRAULICS AND OPS CHECK, FLIGHT ALL SYSTEMS NORMAL. (K)