As a radio/electronics tech from way back - the easiest faults to locate is usually when the equipment is "dead". The Microair in my jab never faulted in the 12 years I owned it. As for paying $2800 for a radio, that's is just so wrong. An aircraft radio is just an AM transceiver, like the old AM CB radios apart from one being on VHF (the aircraft radio) and one on HF (the CB radio). Nothing, not quality control, not operating frequency, not bells and whistles, nothing justifies those sorts of prices.