I forget, can you get a vise grip on it? If so then turning it like your unscrewing it wonít hurt anything if itís just held in by O-rings and just in case itís threaded is likely the way to get it out.
Iíd also use heat gun heat, not torch, but a heat gun and stop when it will fry spit, try to loosen, let it cool, try to loosen and repeat.
Finally before I got real stupid with it, Iíd try to remove that breather and before you remove any lube measure the oil
level, itís very likely that you can use it as the access to both suction out the lube and to measure quantity.
Once suctioned out, measure how much you got out and compare it to the books
stated capacity, it should be close, but if you measure accurately how much you got out, replacing that amount ought to put you right back to your starting level, just with fresh oil.
There may be more than one way to skin a cat.