Hello all. I have older late 1978 Cobra 2000. Works good. The modulation meter isn’t doing anything when I key up and the switch is in the mod position on AM. Just curious if there is a transistor that switches this circuit on that might be bad? I have good audio out but the mod meter just doesn’t do anything when I key up on AM. I checked and sprayed with contact cleaner VR7 with no success. There is a roger beep board in the radio but I don’t think that has anything to do with that. Thanks…

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