Fivics Aegis Wheel Replacement

I've owned my Aegis case for about three and a half years, and now the wheels are dead. The bearings are toast and it sounds like a bag of spanners.

Has anyone replaced their wheels? How do I remove them? I have my local skate shop looking at replacing them with scooter wheels but I need to replace the stub axles for that to happen. How do I get those off? Fivics website is less than useless btw.

Any tips would be very welcome.