Even in the case of a defective part, THEY pick the parts. Guys who don't know much about motors and what parts are good expect that the company building it DOES. Maybe the parts they use are hardly ever defective and are good parts, if that's the case...for a company so big, why not just eat the labor costs and put the thing back together...settle the $$$ for the broken rings with the parts company if they really believe it's their fault.
This was why I said it should be taken care of. Giving the benefit of the doubt that the ring wasn't damaged on installation (Seen it, done it), if there was a "bad batch" I'd think again,the rings to either side of that one might also be a prblem, and the manufacturer would know about it... I'm picky, and I pick the parts in the engines I build. At minimum, I "ok" the choices based on my experience, the cost factor, and most important the use factor. In other words, I get paid to make solid choices, and if they do break, it is my issue. If I spec a budget build, and the guy sticks a fogger system on it and it breaks, not my issue...lol. Most shops, if you follow thier build recipe, and use thier supplied parts, the warranty is honored. If you bring in your own, or tell them to use a cheaper piece, the warranty is forfeited, just for this reason.