|Note 1:||With its cover off, the 5151 is physically unstable (except when face-down).|
|Note 2:||The case comes apart after removal of two screws topside, and six screws underside. On the underside, do not remove the two screws that are covered (photo), because removal of those together with the remainder will result in the power transformer and its mounting plate coming loose within the case and causing damage.|
Opening the 5151 will expose you to dangerous voltages and currents.
Those threats can still be present long after power has been disconnected from the 5151.
Before opening the 5151, adequately educate yourself as to the hazards.
Hazard examples at here.