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Gearbox like you said. Believe there is possibly and engine one. Two at the battery. One behind the drivers headlight. One beside the brake fluid resevoir. Inside the car iirc there are 4 behind the top half of the dashboard and one just next to either rear light.
i'm assuming it's just the engine bay ones to be honest mate. Hard to tell with my issue :S. Just checking, but the front GB one is a strap (kind of greeny colour?).
They all go like this unless the connecting ends are really really corroded it shouldn't be an issue but ideally you want them clean. If it's engine related you might be surprised which earth it is. My old 1.2 I remember trying to fix an earth on the back lights in the boot and disconnected it and for some reason went to start the car and wouldn't start, reconnected it and everything was fine again.