Hi Everyone.

On my previous cars I used to do a complete drain and fill of power steering fluid once every couple of years.

My NC has some really manky looking PS fluid. It's a muddy purple/brown colour when fresh ATF is supposed to be clear red.

All the info I find on the internet and even speaking to a Mazda dealer mechanic, I'm being told that it's a completely sealed system and isn't meant to have its fluid changed.

But how about this bolt on the rack near the pinion gear (pictured)?
https://photos.app.goo.gl/beJKG3HDQbGmEaaH6

Would loosening or undoing this bolt allow me to drain the fluid in the rack?

Would undoing this bolt get me in any kind of trouble?

Thanks in advance for your replies.