More retraction tests. Closer, but still won't quite go into up lock. Maybe 1/4" (0.635 cm) from engaging. Back under for a couple more hours before I finally see where the blue from the fitting is rubbing on the side of the tunnel where the seat joggle is. Tried the application of abrasives but they weren't up to the task. Getting hot, humid and late so I went home. Back the next day with tougher abrasives.