Jerry,
I just removed mine from my 722.3xx. Nothing flew out. The problem I had is that after removing all 16 or so bolts, there is a gasket covering the entire thing. Mine tore in one corner so now I have to replace it. Also when putting it back, be carefull not tightemn too much(8nm) I think which is pretty light. I'm curious as to why you are taking it out? my 300SE doesn't upshift