Unless any disk got damaged, data and pools should be fine.
If you have a spare PSU try it, but from your desc at least to me not seems a fail PSU
Btw this Is the script mentioned above.
IMHO what superior mean for you 
I sidegraded very recently, there are pro and cons… Personally i faced some minor problem and besides one i can’t still resolve (TLS on ssh), all seems run smoothly. But im a simple home user, can be different for everyone.
In your place i would think about Scale migration after have fixed that PC 