Okay, gotcha. If I were in your position, I'd do my 6 Ps (link: [ http://www.twinturbo.net/net/viewmsg.aspx?forum=technical&msg_id=922678 ]), and purchase any parts related to that diagnostic to fix any possible issues. If that comes back clean, I'd look into purchasing a service manual and change out any fluids that need it. Best of luck!