I recently noticed slight movement in the inner rear wing panel adjacent to the drivers door which was the result of delamination of the outer wing panel and the bonded inner door moulding. The inner moulding still has the original anti friction tape on the inner face so I assume it is general wear and /or the usual deterioration of panels and plastic fittings
Problem easily solved with a small amount of Sikaflex 221 between the two panels which were then clamped together overnight. Passenger panel fine.