rainwater in engine bay

Hi there guys ,, so I have a 2011 Altea 1.6 and seen a 2011 Xl on marketplace, done the deal but still haven't parted out my old one. Wanted to sort out a few niggly problems. Item one ...reverse gear is hard to get into, S/h gearbox was fitted a while back. Luckily my son is a mechanic and he...