I know you're goofing phin, but it's not defamation if it's true. http://www.nolo.com/legal-encyclopedia/defamation-law-made-simple-29718.html

So it's really just a statement. One I've not seen refuted by the way. So unless they are lying about the check they have no grounds to sue for defamation.

IMET on the other hand could sue if it was not their manufacturing process that cause the issue with the boards since AMT has openly blamed them. And this could obviously injure them financially.