These radios are notorious for having bad external speaker sockets on the rear of the radio I have several and they all suffer from it. I would suggest having the External speaker socket and the PA socket both replaced with new ones The stuff from Radio Shack is about the same quality as what came in the radio if you want better look for Switchcraft Plugs and Sockets.
The repair may not have been done correctly, and may need to be done again.
You should try connecting a speaker to the External Speaker jack on the back of the radio to see if it is a problem with the internal speaker or not. If you have the room, use the external speaker - you can choose whichever type you like and not be stuck with what is usually a cheap, crappy sounding internal type.
Good luck!
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