The high pressure power steering hose will commonly leak fluid and should be replaced if this is the case.
Car Problem Reports
Pontiac Montana High Pressure Power Steering Hose Can Leak Fluid
Pontiac Montana Problem
Average Mileage: 161,500 mi (137,000 mi - 186,000 mi)
Visitor, 2000 Pontiac Montana, 186,000 mi
Line leakage confirmed by running the wheels to left lock and maintaining high pressure; the leak is at the line-to-hose crimp. This line is next to impossible to get loose from the rack due to heater pipe placement.
Visitor, 2000 Pontiac Montana
I had the hose replaced and the next day the car leaked again so I called and when I had a chance I brought it back and they said it was the power steering pump so I had that replaced. Then another month later it started leaking again and I got mad because they always left my car till the end of the 3 days they had it and I had to yell at them that I had to have it back and wait at the store. Now I hate to take it there under warranty as they may say it is something else or not honor the warranty or something as these type of shops are really good if they fix your car at first (many times they do) but if there are problems it is hard to get them to honor their warranties and they want more money.