I suspect your bulbs are LED's and you can get those at Radio Shack. You need a soldering iron to remove and replace them. Since they are diodes, there is a right way and wrong way to put them in. Pay attention to which leg is longer when taking the old one out and put the new one in the same way.
On my panel, not only were a few LED's bad, but the logic chip for the gray tank level sensing was bad. Again, it was a Radio Shack item and cheap. Tough to solder all those pins in, but worth it.