I have a technics receiver which began showing a F70 error message awhile ago. Took it to a panasonic authorized dealer and they replaced the power supply. Didn't work. The error code came back. Brought it back to the dealer and they replaced the main board with one of the micro chips. That didn't work. Brought it back again. They replaced a 2nd microchip and that hasn't worked. Still getting the F70 error message and the systems turns off. Any suggestions?

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