It is a simple matter to get inside the t530.
First remove the back panel by releasing the catch at the bottom and hinging (is that a word?)
it up. (There is a tongue at the top of the panel that slips under the edge of the top cover).
The panel also has a number of catches on it that click into the metal of the back panel
so it does take a moderate amount of force to free it off.
Here you can see the bottom of the panel coming clear.
With the back panel out of the way you can see a green button above the ethernet port.
Press this button to release the catch holding the side in place and you can start removing
the side panel by lifting the back edge.
Added February 2021