This transceiver has been working satisfactorily for over a year, then the audio on 50 MHz suddenly failed last week. Whilst this is billed as a Quad Band Transceiver, the righthand VFO appears to only cover 144 MHz and 430 MHz. Is that how it should be, or is that another fault? I am specifically wanting to use the 50 MHz band. On the lefthand VFO there is no RX or TX audio on 50 MHz or 29 MHz. It transmits a blank carrier on those two bands, but that same VFO works fine on 144 MHz and 430 MHz. I have tested it using a power meter and dummy load, used a different PSU, and tried carrying out a full factory reset at least three times. Anyone got any suggestions please?