That was back in Nov. 2014 and if I remember this right there is a bolt that sticks down at rear of the I Beam that can be sheared off. An example he gave was: If a road is being re-paved and they have taken up the old asphalt sometimes the manhole covers etc can be sticking up. If you straddle one when you run over it and the car is lowered far enough, the bolt can be sheared off and it also holds up part of the rear end/ differential etc. The shop Mgr. was talking about making a type of skid plate to add to the I Beam to keep this from getting damaged.