1999 Cessna 172S Came out to find the display partially out then suddenly in-op but the radio seemed to worked for a bit... then nothing. Local shop says it is a common failure on these radios. The FBO had says their 172R did the same and they had to replace the radio. I am an old school electronics bench tech and find that hard to believe. I'm thinking maybe a display replacement is more like it. Anyone have any help in this regard?