Neck for my FG-180

Finding a replacement neck would mean buying another FG-180 and having to remove two necks, and then set the second neck properly in the good guitar.  Removing vintage FG necks is very difficult.  See my Neck Reset Procedure and Difficult Neck Removals posts.  Even with woodworking experience, this is a whole different animal.  And not something you want to learn on a family heirloom.

What is wrong with the neck??