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Welcome I'm Chris aka Moose
The first thing we need to make sure of is that all 3 rear brake lights the lower 2 and upper one illuminate when the brake pedal is pressed. They should come on and remain on after pressing the pedal 1/2 inch. The shifter has an interlock solenoid that prevents shifting from park unless the the brake is pressed and the solenoid on the shifter energized. I bet so far with no diag done yet its the brake switch or the wiring right bear it with the issue.
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At the BOO brake on/off switch on the pedal, test the light green/red wire. It should have battery voltage. Then test the light green wire, it should have power when the brake pedal is pressed. If those pass then there is a break in the light green wire after the switch.
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