Don't buy a power steering pump if yours is making noise for the first ten minutes of the day. Buy an O ring, Part # 3449AE020, from Subaru. Remove the bolt that attaches the fluid line from the reservoir at the pump, twist a little and it pulls right up. If the area is dirty first brush it off with an old tooth brush, to keep the dirt out. Carefully pull the line up, replace the O ring, and push the tube back in. Tighten the bolt. Start the engine, and turn the wheel side to side a few times to bleed any air out of the system. Happy motoring.