A local church has an older IBM ThinkVision E500 that is shutting off periodically. I'm told that they use it between 9 and 12 on Sundays and it'll shut down 3-4 times in that period. Works fine then shuts down. Of course, when I went in to check it out it ran 35 minutes with no problem. The bulb counter indicates 31 and 209, which I assume would mean 209 hours? There's no legend to indicate what the two numbers represent. What's the normal bulb life? What else might I look at? Thanks.