I suggest you find a known good speaker and hook it up in place of one of the ones that doesn't work. If you measure the speaker diameter, you can probably find a close match on eBay or Amazon. Most speakers have an 8 ohm impedance, but some are 4 ohm; they're usually marked with impedance and power rating.
Although you can check the AC voltage going to the speaker, you have to have a load on the output. Neither a multimeter or oscilloscope will have a low enough impedance to load the output; you need a speaker or 8 ohm resistor to do that.
Aside from failing speakers, the most likely causes are bad speaker wire connections or bad switches in the radio.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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