HD 11 EP front hydraulic issue

I recently been spending time cleaning up the old dozer, fixing the many cracks, and giving her a fresh new look. I finished putting the blade back on the dozer last night and found to have a front hydraulic leak coming from a bolt behind the control bank.i still have good pick up on the front blade, and enough down force to pick up the front of the machine, and also cleaned up and replaced the copper washer, still no luck.. I was not able find much info regarding the front hydraulics so I was hoping you guys could help! I still have my tilt hoses bypassed (should have new hoses next week). I did recently change the hydraulic fluid to a SAE10 (was ATF) .any information will be greatly appreciated as there is not many people who work on this old stuff anymore

thanks!

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