What your dealer has told you makes little sense. If reducing the amount of oil fixes the issue, why fit a modified breather? I think many dealers just make stuff up. The real root cause of this issue is still not clear.Probably as less oil in it, spoke to my dealer the other day & he reckoned there's no new breather being fitted at the factory, just less oil added. Any found with leaks then they apply for the retrofit breather. Same goes with the undertray, he's not heard of a new one. This is his view so if that's correct I couldn't say. Also as I've previously mentioned, I still thing it's a heat warpage issue, may be some vehicles on the ships are over heat vents. This may account for some being flat if not over said vents.