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I had a problem as yours. The shop answer was to sell me a new audio panel.
turned out to be corrosion on the main battery/alternator switch. $1 worth of new connectors fixed the problem.
Went to KMPO, Moyer Aviation.
results are mixed.
attention to detail is my biggest concern. They had to send my GTN650 out for software upgrade and delivered it with all kinds of error messages flashing. Found out you have to reset everything when reinstalled. They did not know that. Also a broken egt probe not noticed on delivery or test…[Read more]