Subaru Forester 2003: When to change the water pump?

SUBARU told us it is not necessary to replace the water pump every time the cam belt is changed. The company says current spare parts sales for cam belts are more than six times those of water pumps for the Forester. But they say some workshops recommend checking the water pump when replacing the cam belt because replacing the pump requires the cam belt to be removed. It is suspected some workshops replace the water pump unnecessarily because of small signs of seepage from the breather hole. Slight seepage is normal as this is designed to drain water pump seal seepage. Subaru Australia issued a bulletin to dealers in July 2006 to inform them of this.