How to change tubes inan Ayon CD2s?

This has probably been covered before but does anyone out there have experience of changing the tubes in an Ayon CD2s. I've had mine for a number of years and it has been used a lot so I'm thinking about replacing them. I read somewhere that this is not an easy job and also that the tubes were soldered in?
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Remove the cover and just look. I read the same thing and am not sure if its true or not. Otherwise, you'll be arguing back and forth forever with other posters that know for sure, and you won't know until you remove the cover anyway.
I had the same problem. Look at the pictures at the bottom of the review. They helped me ....