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r_mash
It's been a while since I've worked on a hope hub......
The end cap should just pull off, you may need to use pliers/mole-grips for more purchase, in which case wrap a rag around the end cap to protect it cos it's soft alloy and damages easily.
No bearing removal required, just pull the freehub body off. Make sure you keep an eye on the pawls (try not to lose them!) Give it a good clean. Doesn't make any odds w/regards to the grease. But if you want to make it quieter, then the thicker the better really. Only issue is, if it's too thick or you use too much then the pawls won't engage properly.
Use an old shoe lace or a ribbon or something to hold all the pawls back in place when you want to put the freehub back on, as it's a bit tricky. Some people use the freehub seal, but I find that less effective.
The freehub will run quieter for a while, but will end up noisy again at some point in the future.
Good luck.