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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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