[Amps] Broken band switch in TT Centurion

[Ignacy Misztal]

In my Centurion, the bottom screw of the band switch became loose, the
screw fell, and the switch arced. Now, some it does no work on some
bands.

Did anybody have this experience? It seems that getting to the switch
takes time. Is there any easy way to do it?  If you have only half a
day to loose, would you fix it yourself or rather send for service to
TT?

Ignacy, NO9E