One of my 1D IV's came off the lens when I was taking the Rapid R strap off friday night. Lens stayed attached to the strap, body went bouncing off the track. I am guessing when I changed lens back to the 70-200 I did not lock it in. From what I can tell mirror mechanism messed up and nice crack down the case near the hot shoe.
Not sure if they can replace the housing or not?