flip to channel 6 during the day and see if the meter swings. Transducers go bad, even new speakers. I fixed quite a few radios that had bad speakers or mic elements. If you can see RX, try and external speaker.
I have had 2 cobras with bad speakers, One I fixed and sold, the other it aint worth the cost plus shipping. Just keep it around, one day I might find a junk radio for a speaker.