maybe try checking to see if you have a voltage present at the bulbs?
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these light are part of the switch matrix, Column 8, Rows 7 & 8.
in the manual: https://www.ipdb.org/files/570/Bally_1994_Corvette_Manual.pdf
both buttons should have a common Yellow/Gray which is row 8 which join to the power Driver Board at header J138-9
the other wires, Row 7 is located at header 133-8, and 133-9 for the Start, assuming all other light switched lights are working my guess a break in column lane wire has happened, i'm leaning towards a connector/plug issue and/or open circuits?
have you tried measuring for voltage form the yellow/gray to ground at the PDB or at the bulb/lamp holder contacts?
there must be voltage at the PDB as the other column lights are working.
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