when doing a leak down test u can tell what the problem is just from using your ears and eyes. if air is blowing by rings take oil cap or dipstick out and listen closely for air coming through. if blowing by intake valve listen at throttle body and if blowing by exhaust u have someone listen at the tail pipe but remember lsiten carefully and my money is on either valves or a a ruined valve seat chipped valve bent valve ect...