Start with testpoint TP100 on the powerdriver. Is this exact 12V ?
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Seems to be a problem on the CPU-board itself.
Check if there is 12V across pin 3 and 12 of U16
Could also be a problem with communication between ASIC (U9) and security-chip with surrounding chips.
Try a reseat G10 (security) and a gentle push on the ASIC
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