I was concerned because one of the main ribs (MR5) seems to be under some stress and bows in and out slightly. I inspected the rib and compared it to others but found no differences. It seems to be just a smidge too long and binding crossway. I sanded down some primer in the area of contact on both the FWD & AFT spars and this seemed to help a little. I`ll check on this later to see if is of concern.