I would first remove the pump & check the oring grooves to be sure you hadn't missed any stubborn remnants of the old orings in the bottom of the grooves.
Take your "new" orings with you to a hydraulic parts & repair shop & see if they can provide you with slightly oversized ( thicker not larger diameter) vitron orings.
Check the flatness of both the pump boss & hydraulic line block with a straight edge. If they are warped take a flat mill b-tard file & GENTLY flatten the surface, the pump housing is aluminum so go easy, a little goes a long way. After removing 10 to 20 thousandths from each this will squeeze the orings a bit more & hopefully stop the slight leak.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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