I am trying to make a report or some kind of display of up/down status on all of our assets. I would like the down to be in red, up to be in green and problem to be in yellow. I have searched the report site and knowledge base but can't find anything.
Unfortunately, nothing like this exists in Lansweeper.
You would need something like PingInfoView, MultiPing, WhatsUpGold, SmokePing etc, there are plenty out there. Just depends on the amount of detail you are after.
I would look at something like MultiPing (Windows if you're after a basic up / down etc). If you're talking external accessible sites etc, then check out https://uptimerobot.com/