What was found
PILOT SELECTED GEAR DOWN WITH THE GEAR HANDLE, BUT THE GEAR DID NOT COME DOWN, AND AFTER 15 SECONDS OR SO, THE 2 AMP GEAR CONTROL BREAKER TRIPPED. A SUCCESSFUL GEAR EXTENSION WAS PERFORMED USING THE MANUAL HAND PUMP SYSTEM. JACKED AIRCRAFT AND SUCCESSFULLY RETRACTED THE GEAR, BUT GEAR WOULD NOT EXTEND WHEN SELECTED, BUT THE HYDRAULIC POWER-PACK WOULD RUN, BUT WOULD NOT BUILD PRESSURE TO EXTEND THE GEAR. PROBLEM WAS TROUBLESHOT TO BE A FAULTY GEAR CONTROL SOLENOID, WHICH IS ATTACHED TO THE SIDE OF THE POWER-PACK. ECONOMICS DICTATED REPLACING THE ENTIRE HYDRAULIC POWER-PACK. SUCCESSFUL GEAR OPERATION WAS OBSERVED AFTER REPLACEMENT.