It sounds like your on the right track. The entire green cup moves. And it is leacking behind the cup. Which makes me wonder how if the green cup was not removed since they are half shaft replacements. I would appriciate some pictures though. If you have time pales send them to me at tony.c.0313@gmail.com. I'm taking it back to the mechanic to have him inspect it. I hope it is a easy fix since I am broke at the moment.