Liveduo red lighit, disk b errors. replace drives or whole nas

I have been using a live duo for quite a few years now. within the last week the led went red. I ran the long diagnostic abd that seemed to hang at 90%. i ran the short diagnostic and it mentioned disk b errors. I then ran the log but can’t find any record of where that log got stored. I did not find it in any programdata folder like it says in the manual. I am trying to see what data I can pull off the drives now. if I replace the drives should I be good? how would I know if there is a problem with the unit itself? I was considering swapping in 2 6tb wd red drives if the unit itself is still good. is there a way to be sure? thanks in advance.

I just noticed i am in the wrong section. found it under legacy devices.