You'll have to open up your processing unit, to see what goes wrong. Either something is clogged, forcing liquid out through places it is not supposed to go. Or something is leaking. Both are bad, because the motors and electronics generally don't get better with cleaning agent leaking all over them.
The pump is easy to fix. It's just silicone tubing going trough a U-shape and a set of rollers pushing the liquid through; A displacement pump. Replacing the tubing usually fixes the problem. Make sure you keep the bead in the tubing; That prevents the tubing from being pulled through the pump.