Principally corrosion, not just the visible bit but where the glass meets the metal you can usually see signs of it if it is present. Definitely need to take the wings off and examine all the parts. That is not a big deal to do - 20 mins! Fittings should have been kept greased all over. Other main point is the 1/8" thick plates should be parallel and not bind on the wing tongue and fit of the taper pins which should be slightly proud of the surface and again free of corrosion. They can be lightly ground with grinding paste to get them snug. Also check the 4 1/4" through bolts for thread quality (rolled - not cut treads) , corrosion etc. These can be replaced if unsatisfactory. Also look for surface cracking of the glass around the fitting in case there is any sign of poor workmanship causing movement of the spar cap. That pretty rare.
In my opinion the wing fitting issue on the VE has been overstated : actual failure (with or without early signs of failure) is very rare / almost non- existant. There are a lot of doomsayers about! I have every confidence in my VE. It is immensely strong and Rutan built in very large factors of safety. And it is an incredibly fast, efficient and benign handling aircraft. And very good value for money when compared to other types.
Regards
Steve
