The glider I was referring to didn't have an incident report. We tried to rig it, couldn't make one of the connections in the fus, noticed witness marks where the rod went through the fus, so packed it back up and took it to a repair shop who did the repair super-fast as we were due to fly a comp the next week.
Club gliders where I fly have needed repairs because someone has done a good DI and spotted an issue.
So it's not safe in my experience to assume an incident report will always precede a repair.
If you have to make a hole do to an inspection then it has to be repaired, properly. You could end up chasing your tail.
Also wings and maybe tailplanes are not necessarily interchangeable. We had to have a new wing on a K21 and part of the process is fitting that wing to that glider. Whilst Grob don't build K21s I doubt the process is different on their gliders.