After a power steering flush can other things happen to require further mechanical work such as replacement of power steering pump hose rack and pinion?

ALL RUBBER COMPONENTS (HOSES/BELTS) SHOULD BE REPLACE RIGHT ABOUT EVERY TWO(2) your rack and pinion should only be replace if is going bad or if is already bad. For example once the inner bushings on your tie rods brakes or crack, the entire unit needs to be replaced. if the rack is leaking it needs to be replace Even if there is NO noticeable changes in your steering of the vehicle. This is done for SAFETY REASONS.