If the Builder doesn't want to warranty the problem..... Drain the
Oil and see if the parts fell to the bottom of the pan.....you might be able to get all the broken pieces with a magnet...the only other option would be to drop the Pan and clean out the debris.................since Your engine died at low RPM ..You might Luck out ..! without any damage to the engine....
The post by Rick Lake hit it on the nail........!