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A good, but ugly way to replace a broken trace is to remove what's left of it and replace it with a cut-off lead from a resistor. If the whole thing isn't actually lifted off but just broken or lifted in the middle, you use the cut-off resistor lead to bridge the two pieces and solder it to the traces. This, for example, is what I did with my repair on the infamous blown trace on the back of the later electronic speedometers.
Using solder alone to bridge something is not a good idea, because it's brittle on its own and won't take a lot of vibration or flexing.
Well, I wouldn't put it on the Space Shuttle, but as long as the traces are not actually floating way above the board (where they will vibrate and break), I'd push the trace down flat against the board and tack it down with (a very little bit of) Superglue.
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