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Patrick;
If you didn't do the smart thing and anti-seize all the fitting and bleeding nipples in sight when the components were installed, which would make this a no-worry-operation, pretreat with a penetrating solvent/oil well before you before you need to loosen them...like Liquid Wrench (old school) or PB Blaster (new school...I have little experience with it, but one sees it recommended here often), and days before you plan to actually do the work.
Do not use an open-end wrench which only contacts on two faces and can round a stubborn bleeding nipple, but use a box-end wrench...and 6pointer is better than 12...some "feeling" when applying force to the wrench is also called for...
"Brilliant Tip": If you are able to loosen the bleeding nipple without damaging it, remove, and anti-seize the threads and seat before reinstallation and bleeding procedure.
Good Luck
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