I'm in the process of removing the right tank due to a major fuel leak. I've removed all the screws around the perimeter, 18 bolts that go forward through the spar, 3 bolts near the wing root going aft, the fuel lines etc and the bolt at the front inboard attach point. Using a mallet and 2"x4" at the rear edge, the outboard portion of the tank is loose but the inboard portion won't move. It acts like it is still attached to spar but I can't figure out why. Any suggestions?