wow- that's amazing! Be sure to send it to Hobbyservices for warranty repair- there it will be free. There's a link at the kyosho site for repair work.
I can not beleive this! Well- good luck with the regular diff. When my newly replaced one-way goes out i'm going to send it for repair again and again till they get a clue. The good thing is that they sent back the broken one so that I can have a back-up after I press in a new bearing.