As Arctic shows replacing the whole loom is quite involved, he also shows, how after a little dismantling, there will be plenty space to effect a repair if needed.
If some or all three wires need replacing just make sure you use the same size of conductor, soldered joints covered with adhesive heat shrink will make a permanent and waterproof repair and finally wrapping the repaired section with tape, including overlapping both ends of the convoluted tubing, self amalgamating tape or similar makes a good waterproof covering.
But, before you do any surgery or dismantling do as has been mentioned and check the out puts and inputs at the plug.
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Common sense isn't a gift, it's a punishment because you have to deal with everyone who doesn't have it. 
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