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Yesterday I also started pulling out the corroded passive components right above the battery.
These are part of the Amber scan doubler, which works just fine now, but would eventually start malfunctioning as the corrosion progressed through the solder joints.
Clearing the pads from the hardened metal oxides was extremely difficult and fatally damaged a couple of traces which were half corroded anyway.
But you gotta do what you gotta do...
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