Problem with convertable top?

I have a 2002 Ford Mustang and the convertable top will not go up. When I first got it; the top would go up kind of slow but it would still work. I didnt use it that much but when I trued to bring it up the other day, it seemed like it didnt have anough power to make it up. I checked the pump under neath the back seat and their is plenty of hydraulic oil in their. Also note that it goes down fine just not up. Anyone else have this problem? Please help, thanks!

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