Replaced door handle.
problem was the button was broken and someone super glued the rubber bit back and it failed to work on many occasions so was very temperamental and super annoying.
so I finally found the same colour door handle on eBay for £13, instead of actually swapping handle for handle I swapped the rubber button. Quick job 10mins.
you have to remove the whole door panel lock to get to the t30 screw behind holding the handle in place.