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If the break is really small you might get away with just bridging it with solder
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Experience tells me that even if I repair a hairline / invisible crack with just a blob of solder the solder, being soft, will eventually crack in the same place especially if it has to withstand the might of an enthusiastic typist, as in this case. A track break, no matter how narrow, should always be patched with wire (which can bend if the board bends) and not just with solder.
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it does seem he'd got it wrong that the keys should be very low resistance when pressed
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Didn't he try it, though, after cleaning all the pills and the PCB fingers? Maybe the circuit does expect lower than the >1K he was seeing.