Hi sorry run out of time last night and it always takes a while to explain the easy tested method is get a bug spray bottle fill with water and a washing up liquid to make bubbles,lift rear end of car to full height on suspension using the solution spray all round air bags especially around the top metal ring at top were pipe goes in to inflate,then look for bubbles if no bubbles found at air bags then go to compessor at passenger side just 2 fast turn clips to remove cover and spray around pipes in there if it goes down slow then you will be looking for a small leak so be paitent and you will find it,the pipes never normally split well ive never changed them,hope this helps tiga.