You are on the wrong track with trying to link your engine failure with some un-issued recall. You'll end up fighting Isuzu and your warranty company.

It does happen, more often on the 99s, but there have been a few (dare I say many) documented cases of no.1 bearing failure. But don't expect some Isuzu engineer to fall from the sky and admit to a corporate coverup of the defect though.

Your problem is with your warranty company -assuming that you work in/around JAG, I expect that you've seen your fair share of companies trying to weasel out of contracts. Treat it like an insurance claim and keep beating them up with paperwork.