I've just changed three switch covers and thought some photos and info might be usefull to others.
The switch covers have two hinges which over time become week so the cover will either drop down lower than normal on the desk or will be loose.
No 1 picture shows the desk with the bottom plate removed, it's a good idea to number the ribbons and where they go.
No 2 picture shows the DSP plate removed, three screws at the top and three at the bottom, it won't come straight out, one side has to be removed first.
No 3 picture shows the right hand switch board removed, small screws at the front of the desk and trim knobs need to be removed. The arrow on the right shows two removed covers, they are just pulled off but safer to push the lugs from underneath.
To remove the left board, the support (arrowed) need to be removed, this is done by first removing the consul's plastic side to get to the supports two screws.
No 4 picture shows the two boards, support and consul side removed.
No 5 picture shows one of the switch covers removed and the broken switches.