had my power steering gear box repaired by a mechanic, it has oil leakage under the shaft. I bought original repair kit (oil seals) from isuzu store here in cavite. after the fix, there still a leak from under the shaft. Do i need to buy a new one or it can still be repaired? how much is a brand new gear box and how much is a surplus? where can i buy quality surplus besides Banawe in QC. I'm from Imus, Cavite.