a very long shot but anyone familair with the Tektronix 22xx series oscilloscope?

basically I want to know how to remove the outer case.

my gut feeling is there there is an internal chassis, removing the back cover will allow the sheet aluminium casing to slide off.

So fi you have done this, let me know.

Dont remember Tek 22 as such but most Tek stuff I've dealt with, there are 4 screws in the corners of the back panel. remove these and the cover slides off backwards.