For the speech issue, check the U24 6802 CPU chip.
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With a board with that much damage, the corrosion will continue to spread under the green coating over time. My High Speed was repaired and worked fine for a few months, but now its going crazy again and resetting constantly. It will be almost impossible for me to get all the corrosion off the board with those fine traces. I hope you have better luck but these boards are tough once they are damaged.
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