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I had a little time today so I probed both sides of D53 and dint get anything. I attached a pic of the schematic I followed to FT3. I’m not sure why but I see the 7.8MHz at both TP62 & 63 but not TP61 or 64. The components marked in green are ones I checked to make sure not open or shorted all test good and in spec. Not sure if I’m following the correct path but FT3 is the only reference I seen for 7.8MHz.