I've done it, took me 3 hours, you need to be competent at soldering, get silicone cover wire like on "test meter leads" solder on the new wire and pull it through the flexible next cut out the excess old wire now solder each end with heat shrink there's about 15 wires, you can use the same colour wire for all if done methodically note 6 all black cables, some may snap whilst pulling through so use a "wire coat hanger" to push through