My suggestion is opening up the cluster and having a look at it to see if anything obvious happened like a leaking capacitor, or a loose part.

Also, if you can get your hands on a matching used cluster, would be ideal. The stealer might want to cut corners and make you buy parts, because diagnostics of this type of problem can be quite hellish.

However, keep in mind that there are bulbs lighting these. There might be a loose connection somewhere too.