For this job lineset was sold but there was no way to run it. So we did a pressure test found the leak was at the piston connection. Unconnected the piston and found to gaskets on it. Took them off put a new one on. Also noticed the threads were de threaded as well but was able to screw and tighten the seal. Did a pressure test and it was great. Added refrigerant and check the super heat and charge is good and in range and temp difference frome supply and return are 18 degree difference.