remember that the power steering system doesnt ever consume fluid. so it its low. there may be a leak somewhere ex front seal on pump, high pressure line to power steering rack from pump, return line or lines from reservior, the most expensive one would be the power steering rack, those boots on either tie rod are not sealed like cv boots, they are simply dust boots to keep dirt out of the outer seals on the power steering rack. if it looks wet on there or the boot is torn out it is because there is a leak.