I’ll look for the thread, but from what I remember, Framework was sending out replacement mainboards and asking for the failed boards back so they could be sent out for failure analysis. As you say, they wanted to get down to the cause of that mosfet failing. I think there were even some who found the plastic above the mosfet warped from heat, but hadn’t suffered a full failure yet. So the mosfet is overheating for some reason, and eventually failing.