Report on node event down time matched with up time

I have searched around and cannot find an answer to this problem. I can  easily create a report that shows down and up events all in a list, but to make any use of this I have to  stick them in a spreadsheet and copy/paste to match the up event to the  down event. Over 800 events means this is hurting my brain.

I can find no way to generate a report that shows me a down event  that affected a node, alongside the time the node came back up. I don't  need to calculate the downtime I suppose, that can be done elsewhere.  It can't be true that I have to continue by copying and pasting cells  in excel every month. Say it ain't so!