To remove the power amp chassis, take out the five #12-24 machine screws
on the bottom of the unit. There's no need to
screws attaching the feet or corners.
The amp's power chassis is heavy so be careful. We usually take the 3
rearmost screws out first.
Then we hang the front edge of the amp over the edge of our
workbench and remove the last two screws from below.
This keeps the chassis from sliding or falling out after it's free. You could also stand the amp on its left or right end.