All good answers, but if flushing the system is not effective you could have a bad spool valve- generally you just replace the rack, but in some instances you can just do the spool valve (aka rotary valve) and save a few bucks.
thanks, i am already deeper into this thing then i wanted to be, so right now, my plan is trying to figure out what the issue is, get a quote and knock that off of the sales price so whoever buys it know what they are getting into