Hydraulic leak

[Neighborbill]

I have a BX23S. It has the front hydraulic connection installed by the Dealer. Parker flat couplers.
The couplers protrude for a steel box or what looks like a box ( a protective steel container) . Some where in there I have a small leak. I need to remove that steel box but I can't get it off because the couplers are bigger then the hole in the box.
The only way I can take that box off is to remove the flat couplers.
Here is the problem.
I'm sure that if I unscrew the parker flat coupler, hydraulic fluid is going to either leak or shoot out. I need to take the couplers off and then I can see about the other fitting.
In addition, where do you fill and/or look for hydraulic levels .

 

[North Idaho Wolfman]

With the tractor not running but key on, engage the third function both ways.
TADA no pressure in the lines.
Have a small catch container for the little bit that might come out when you remove the couplers.