I usually remove the tape reader for better access. Remove the wires from the fuse holders on the right side of the terminal strip. This prevents breaking the fuse holders. Remove the 4 screws that hold the white horizontal capacitor assembly and pull the right side out. You will see a black heat sink on the back of this assembly. Remove the screws holding it. You will wonder why they are so long. The bridge rectifiers are mounted on the inside of this heatsink.
Good luck
George
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)