What was found
AIRCRAFT WAS INITIALLY EXPERIENCING LANDING GEAR OPERATION PROBLEMS. PROBLEM WAS TROUBLESHOT TO A BAD LANDING GEAR HYDRAULIC CONTROL VALVE. REQUIRED A REPAIRED VALVE AND INSTALLED. ALL OPS CHECKS WERE GOOD. ON THE FIRST TRIP, PILOT REPORTED HEARING THE HYDRAULIC POWERPACK CYCLING EXCESSIVELY. FOUND NEWLY INSTALLED REPAIRED VALVE TO BE BYPASSING INTERNALLY. REMOVED AND REPLACED VALVE WITH ANOTHER REPAIRED VALVE. VALVE OPERATION WAS NORMAL. AIRCRAFT WAS RETURNED TO SERVICE.