The cords are sealed into the earphone. You can take a multimeter and test the continutity of the either earpieces, once you are convinced that the left side is faulty, first of all use a small thin needle as the probe, use your multimeter in the continuity range, holding one end of the meter probe to the jack , inset the pin like an ijection into the wires to obtain the connection, it there is no connection out of the headphone jack, I think you can replace with a new one to be soldered. If not proceed to the earpiece to confirm, then open the sealed unit and be lucky if the earpiece is not damaged but only the wires. Good Day
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