Hans,
On the informative website
http://pagesperso-orange.fr/p-47.database/
I found at least two accidents of French P-47s, both of GC II/5, which was stationed at Niedermendig after the war as well.
44-33677 7-8-1946 Crashed nr Hatzenbühl. pilot Andrieux killed.
44-33768 8-4-1946 Landing accident at Niedermendig. Pilot: Marcel Ferriol.
Perhaps if you browse mentioned website you can find some more...
Grüss,
Leendert