hey guys I have two york ykekemp8-ctfs. both units developed leaks on both of the pressure relief valves that caused a full loss of charge. 1700 lbs. it is possible that the instalation was the cause of the problem but i doubt it. the problem I am having now is that I cant get the reliefs to seal back up. i've tried several times with the old valves and with new ones. it seems like i just cant get the lock ring tight enough. so any suggestions and does anyone know why the service valve with two reliefs instead of just one pressure relief valve like most other chillers.