The spare wheel winch cable on my second hand C8 has been mysteriously frayed for a while, probably from before I bought it. This has not been a problem. However, when my local Citroen garage replaced a wheel during an mot, the cable became detached from the winch mechanism. Although still held in the housing the cable could not be rewound. Is this a common fault? How could this damage happen. Should the garage fix it, or could it have been there before they removed the spare wheel?