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Re-apply thermal grease. Make sure to use an appropriate type. Hint: CPU paste is usually not the best solution.
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Apply a little dot on the pad and place on the heatsink.
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After speading it with a spatula, stick two together, and slide to distribute evenly.
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Careful as to not damage the pads!
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Apply a thin layer using the spatula on the transistors as well.
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Mount the amplifier board back on its place.
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Carefully set the transistors using the screws.
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Fix the power board using its screws.
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Check that there are no shorts between the transistors and the heatsink or backplate.
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Conclusion
To reassemble your device, follow these instructions in reverse order.
