Ashdown Radiator 1 - how to access chassis?

[Groover]

A friend has an Ashdown Radiator 1 acoustic amp with a questionable input jack. I was going to take a look at it for her but I can't see where the bolts are that secure the chassis. My guess was that it is accessed by removing the grille and speaker, since there are no screws into the cabinet except for the ones holding the corners and feet, and neither appear to go all the way through the cab into the chassis.

Has anyone worked on these? How do you get the chassis out?