Don't do a pump or the bad rack is just going to take it out again.

Do pump , lines and rack. When this happened to me, the filter for the p/s was FULL of tiny metal fragments. This was after a new pump. So I did the rack pump etc. Went away and hasn't been an issue. Luckily a rack is easy as is the pump if you have jackstands (rack) and ramps (for pump)