Adjusting a fully-depreciated asset?

Hi All-

We have some old assets that have been fully depreciated and that are beyond their stated life. However, in the past year, additional components have been purchased for some of these assets, so we have additions for fully-depreciated assets. I found the note below, which suggests we're out of luck for adjusting the old assets, but I thought I'd check here.

Is there a way to add these new costs to the old assets, or will that create a catch-up depreciation nightmare for us? I suppose that alternatively, we could create new assets, but not sure how we could tie the new assets to the older ones.