Has anyone had success repairing a latch problem on the top case? On mine, the latches on the left do not move, remain in the unlatched position. Ones on the right work OK. Is it difficult to remove the inner liner to get at the mechanism? I am fairly handy but have this fear of removing screws and bolts, then parts fall inside and get lost, Is there some place where you can get a diagram of how these cases are put together? Any help would be appreciated.