I just finished replacing the rear cam end plug. Took several hours but should solve much of my oil leak problems. The rear cam end plug is on the the left end of the rear cam. If you look carefully, you can see the rubber head of the plug sticking out of the side of valve cover. The valve cover, bearing cap oil pipes and bearing cap have to come off. Then lift up cam end slightly and the plug just about falls off. Have to use some gasket sealant in 4 spots when reassembling. Not too bad just took me a while since I wasn't sure what screws and pieces to take off.