Sorry it's taken so long for me to get back to you but I've been away from work and the computers won't let me log into rctech.net.
No fix yet, but the guy before me noticed a high number of snapped or bent axles. There seems to be a small amount of movement at the transmission end, but I haven't had the time to strip it down and fix it yet.
In any case, too much rain to get out and have fun at the moment, so realistically now is a perfect time for a rebuild!
My apologies for the terminology I use, but I've only been messing about with RC cars for a few months. I'm trying though!