The back came off pretty easy only to reveal several cracks in the lamination. We feel this could be the source of the vibration but regardless while the back is off we get to inspect everything. The good news is the bass bar; neck block and end pin block are all good and tight. The bass is remarkably clean on the inside. Once we get the plies glued in place on the back we should make forward progress…or two steps forward with no steps back.