I don’t know? Roon Labs never shared that knowledge? There are just quite a few threads of Nucleus users starting with “After a power outage …” that usually need to be resolved by turning in the unit for repair/replacement. Did you guys ever analyze the reason (what was broken/failed) on these units?
Some of my thoughts I summarized in this post:
Update
PS: It is very likely for power spikes to occur when power returns after an outage. I thought that this is common knowledge but possibly miss-judged the situation.