Ron, any part swapping would void our warranty. We checked with Sharp after the second broken oven/fan housing. We asked if they could just ship a new fan module and we'd swap it in (remove casing, unplug old fan module, plug in new one, put metal casing back on.) They said yes, we could do it but warranty would be voided since we're not authorized repair reps. So we went with the third replacement oven. We don't want to risk hidden damage. They are three for three on obvious damage. Who knows what's inside. She does seem to be working just fine.