Please donít shoot the messenger, but you may find that the warranty on electrical items is a bit tenuous. Get ready for a fight if you were the one that installed it.
As far as the pump, it is a piece of cake on your model. It is located on the passenger side on the inner fender well. The mono valve is on the firewall on the 123s. It is best to properly diagnose the problem Ė find out what is wrong before you throw parts at it.