Why are my dash lights only dead on the bottom half?

I checked the fuse and the dimmer switch. I haven't disassembled anything yet, looking for a guide. The dash lights behind the steering wheel and the radio are OK at night. But the climate control and shifter indicators are dark at night.

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As an unqualified guru, without wiring diagrams to examine and post, my best guesses; loose/damaged/corroded wiring to radio and shifter, possibly corroded ground connections (several around a vehicle). Chassis studs allows electrical/electronic ground connections. Two main grounds; battery negative to chassis and chassis to engine block.

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