You see, that's where your probably wrong ! Unless some other poor slob did the other 8, you've got 12 cylinders to rebuild ! If one leaks, the rest will ! Get ahold of Klause @ top hydraulics on the Oregon coast. He will rebuild all 12 for less than $ 600 bucks with improved seals. Or a $tealer can do them for around $ 12,000.00 ! DO NOT do anything STUPID like trying any treatments. He has exchange programs, or will turnaround in just a few days. On top of that, he will provide step by step instructions as well as other troubleshooting tips. If you fall for the EBay oring fiasco, you'll get really good at rebuilding these yourself, as orings don't last. Best free advice you'll get about power tops !