Hard steering to left only

What is your question?

05 Seinna, development of a small leak on right side. I eventually had the steering rack replacement with a rebuilt Cardon as can only get rebuilt unit if not buying from OEM Toyota. As soon as I drove felt hard to turn steering wheel to left. Not to right but left hand turns only. Took to Stealership and was told (internal) spool valve on pump, $788. $70 for diagnosis fee. Pass. I took to my mechanic who put on a Cardon pump for less than a $100 and three hours labor or about $280 total parts and labor. Same issue existed so no body at this point can tell is it the reman Cardon steering rack? Any ideas?