FM02 Troubleshooting

My FM02 stopped transmitting at the end of the season (last 3 days of show.) However, it is still functional from all other standpoints. It still turns on, still changes frequency with the buttons, it just is not transmitting. My radio sounds the same if the FM02 is plugged in or not is how I determined that it is not transmitting. I've pulled the transmitting board and looked at solder joints and they all seem okay. Where would DIYC suggest I go from here?

Thanks