Leaky P/S rack question

[Pete_89T2]

Just my luck - recently replaced a failing & leaky P/S pump with a rebuilt unit, and now it seems that my P/S rack itself is leaking. Unfortunately, after cleaning the heck out of the entire rack it and observing for the source, it seems it's coming from a place that the FSM doesn't reference any fixes for. Attached picture is the best I can get for now shows the source - where the arrow is pointing. Looks like there is probably a seal under that bolt/cap on the top of the rack, and P/S fluid is intermittently getting thru.

Is this fixable, or is it time for a new/rebuilt rack?