Grob 103 Canopy release failure

Our club Grob 103 Twin III canopy lock/unlock mechanism (front seat) failed on the ground when someone tried to open it. Upon close inspection, one of the 2 hidden bolts closest to the handle had gradually been cut through by the lever action to the breaking point. Though we found a way to replace the bolt, we may want to inspect the other bolts in both front and rear canopies. The problem is that the manufacturer glassed in both mechanisms and there does not seem to be a way to effect inspection other than to cut into the frames. Does anyone have a clue as to how to do this? Have there been reports of similar issues with these models? I can't seem to find any AD's on it.

Here are some pictures of the mechanism taken by a Grob owner in Sweden in 2007 of a damaged frame with a window cut out to make repairs:
http://syntaxsociety.se/~wed/flyg/progress.html

Thanks,
Mike