Anyone knowledgeable on the Yaesu FT-1900R 2M FM transceiver? I have one that has no RX audio; however, it has a normally loud "beep" when powered on and I can hear, albeit very low, noise audio when the squelch control is backed off. TX output and TX audio appear normal. I don't have a service manual and am open to any counsel you might care to share. 73 <> Carl