Is there a way to replace the bulbs for the tire pressure and battery warning lights on back of the instrument cluster?

It sounds like the cluster is going out, the bulbs might be hard wired in, I would remove the cluster and see if you can remove the lens to pull the board and look at the bulbs. Here is how to remove the cluster and pull the broad, if this doesn't work, I would get a rebuilt or used cluster by searching google or Ebay. Check out the images (below). Please let us know how it goes.