I had the same problem with the front couplers on my 140. Tried o rings no help replaced couplers leak stopped. I also used the 90 degree snap ring pliers, but I found that holes in the snap ring were very small. I had to file down the tips on my pliers to get them into the holes. When I replaced the couplers I replaced those snap rings with new ones that a standard set of pliers would fit. It was no fun getting them out.