Hi I'm having big issues with passenger rear door lock sticking so need to change module before it sticks shut for good , so can't decide if I should buy new £92+vat from tps or new ebay copy £50 or third option is ive found a car same year as mine being broken and could get from there but is it worth buying used ???? Also does anyone have a guide to changing rear door lock module ? Is there anything I should be carefull of ? Thanks for any help