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If it is a bad solder joint it could be a cold solder joint in that it wasn't soldered properly during the manufacturing process. Such joints often work for a while then fail. I agree it aught to be an easy fix if you are careful with the solder iron. I once managed to fix a broken circuit board for a friend with little trouble. He'd wanted to put a larger antenna on a scanner box and rather than take the case off to drill the hole he did it with the case still in place so that when the bit went through it cracked the board. Cold solder joints are even easier than that to fix though. You just have to warm the joint up and reapply the solder carefully so that the solder flows over the joint and is solid rather than a bead of solder which is what happened at the factory.
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