I can’t give you a final answer but the storage wear is just an identifier on a general scale, so your CPU might be fine for another two years. It’s just the expected lifetime! The bigger your actual wear the more likey is a failure at some point. It’ll work until the memory is broke. I’m not sure if you can check some kind of SMART data of the internal memory… Probably not. There is just the wear level I guess.
In general I would try to outsource data logging to external storages or a database if possible. Especcialy if you have more extensive logs. How many writes per second or minute are we talking about?
About repair / storage replacement: A colleague from B&R will have to answer that.
Best regards,