You're having a bit of a tough time with that motor alright. Sounds like they're doing everything they can for your motor, and are taking an academic interest in what the problem is, unfortunately for you, they're doing it on your time. Hope the reassembly cures the problem, or if not they just immediately replace the motor. They should really have dome that already and be doing the research on their time, but I guess we're all kind of invested in the story now. Fingers crossed for you. If it does all work well, you will have a completely blueprinted motor, which may be better than factory!