One thing that sometimes causes confusion with resistor color codes is the 5-band precision resistors. Unlike the 4-band types, the first three bands represent the digits, the fourth is the multiplier, and the fifth is the tolerance.
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I’m curious — when yours were failing, did you notice any visible signs on the board like discoloration or heat marks around that connector near the yellow/orange transformer wires, or was it purely an electrical fault that only showed up under load? I’ve got a similar intermittent shutdown...