It's a glider for Christ sake, how long does it do to do a physical inspection to see if any repairs have been carried out and inspect the airframe, log any serial numbers of parts and if needed send them off for overhaul or replace them on a rotating basis, similar with lifted components, if no record, replace them, they must surely have basics like tech logs or logbooks (700 Or whatever it is called these days) to go by. You would at least be able to reintroduce parts of the fleet relatively quickly, heck you could rob other aircraft that have a paper trail for some of the components until you have generated several airframes, and then sort out the others.
I get the feeling you think it takes a couple of days... It will take longer, how much depends on what is found - for example evidence of a repair. The only way to be sure an undocumented repair is done correctly is to replace it.
Robbing other airframes won't help unless their paper trail is complete.