I decided to change out some PS fluid today , I had not touched it since buying the car, its 07 corolla. Well , the fluid I removed was light brown though clear not cloudy. I could see many various size dark particles in the fluid. The PS works fine, the only thing I can think of is a rotting seal or rubber hose. I dont know if I should check into this further or just leave it. Any ideas on what to check. Thanks