Cobra 25LX; Odd Problem

So, I have a Cobra 25LX, that I keep as a backup on my truck. The company split my wife and I into separate trucks, so we could get an abandoned unit back home.

I put that 25 in the other truck, and found that the speaker wasn't working. Temporarily, I ran the the audio through the truck stereo through the ext. speaker jack and the aux jack on the truck. That works.

Stopped a few miles up the road, bought an external speaker. That didn't work. Took speaker back, traded it for another....

Cobra 25LX; Odd Problem