Not the end of the world to remove the inboard aux tank. The structural screws can be a little fussy to remove if they are all painted in and have not been out before. Take time with a good bit on a drill driver and make sure the paint is cleaned out of the screw head for best contact. I like to tighten the screw just a little first then start the removal. Be careful not to torque to much just enough to break it loose as it tightens then reverse the direction.
photos
http://www.337skymaster.com/messages...?t=2309&page=3It is if you have guys who aren't familiar with the Skymaster. Thanks for the pictures, they help out quite a bit.
I think this thing just needs another true annual.