[GarySP]

Welcome DSmith,  I would also replace the resistors in the radio.  You could unsolder each one and take it out of the circuit to test it, but I don't bother.  Resistors are probably the most inexpensive parts in the set, and if you have it out to test it you're halfway to replacing it anyway.  The older resistors, if you test a few, have probably drifted out of spec anyway.  I personally prefer the peace of mind of new components in the chassis, especially when they only cost a few cents each usually.  Take care, Gary