You will have to find out where your leak is. Requires pressure testing with a special tool. Most common is the prop seals. Inspect the prop seals for signs of leaking or damage. Other than that the only choice is to replace all of the seals.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD