I just had exactly the same thing, one of computer bulbs out. It took me about two hours to get it all apart and back together, following Bay 13's guidance. replace all of the regular lights while you are there - four for instruments, and two for the computer display (computer is different bulb than the instruments also). It would have gone much faster, except that I had great trouble disconnecting the computer wiring plug from back of computer display. Bay 13 ignores this connection, while clearly showing how to easily disconnect the wiring plugs for the regular instruments. The two instrument plugs are easy, but they are different from the one plug for the computer. I finally gave up and left it conected in order to avoid breaking something, but that made getting at the computer bulbs very tight. Perhaps someone else will add directions on how to disconnect that plug.
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Mike Sullivan ('91 745 (171k), '93 965 (147k), '95 855T (60k), '98 V70XC (78k). Past Volvo's: '85 744 (256k), '86 245 (165k), '86 245 (195k), '88 745 (208k).