Elevator
With regards the elevator, I am reliably informed that the issue was that a hinge used on other Grob control surfaces was used in place of the original. This was because it does not relly on single use fasteners.
It was a very sensible engineering decision, which did not have the correct administrative approvals. This has now been fully approved by DA/PT, and therefore the issue no longer exists!
Many of the issues with the glider fleets are far less dramatic than the titles alone would suggest!