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I've had noisy carbon resistors cause intermittent grief. They check o/k with a meter but break down when passing current. Since it was the tuner that you disturbed before it came good it might be worth replacing the carbon resistors in it. There shouldn't be many in it but access will be tight. Be careful not to disturb coils and feed through caps etc. The turret will need to be removed to gain access. I'm not a fan of WD40 for electronic work. Use Deoxit as it leaves minimum residue. If you have a spare tuner from another similar vintage set even better. Doesn't have to be physically the same just electrically close enough.
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