I don't know the full solution; however, I do know there is a very small removable light behind the display. You must remove the face plate to access the light, the twist it out with a common/flat screwdriver. Be careful not to brake any retaining clips along the way. And you need to take the dash cover off to get at the radio, a bit of a nuisance.
Unfortunately, GM (of course) does not sell a replacement part. You might try an auto-wrecker, to find a similar inoperable radio but hopefully with a working light. Good luck.
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