On Monday, November 9, 2015 at 11:11:56 AM UTC-5, Dan Marotta wrote:
... but I wouldn't expect to
see many ADs or service bulletins for ships whose manufacturers are
no longer around and I think a 30 year old glider is fully
depreciated.* Any decent shop should be able to make repair parts,
if needed.* Storage can be in your back yard (assuming you have
one).* ...
Dan, 5J

That's a very good point, it's like for classic cars: all you need is to know a good trustworthy local mechanic and to maintain a clean/safe storage/garage.