hey i own a 3ds xl and i once opened it to change the mainboard. But now the cross is somehow foulty it allways moves in one direction(not allways the same one).i already tried to reopen it and clean it a bit but it still stuck...any ideas???

edit: so now i know that it isnt the cross, the circlepad is the faulty thing... i cleaned it abit now it works most of the time, still sometimes its stuck(or lets say the sensors give the wrong signal because the pad is in senter pos.