Yup, I've got to agree with Ayd on this one.. We've had this problem before and Laing simply will not accept these pumps back under RMA thus voiding the warranty for us to them and you to us retailers.
Although this is probably exactly how Laing change the Pro to the Ultra in there factories, they won't accept them back if there is any kind of after market solder or heat on the board.
My advice would be to use a Conductive Silver pen as they are easy to remove if/when your pump dies.