Yep a cap kit will fix any distortion problems like wrap around,fold over etc
Remove the monitor completely from the cab but before removing the chassis, you'll need to discharge the tube to allow you to safely remove the Anode, which will be attached by a red, thick wire that will run to the flyback.
The chassis is held in by small screws underneath the frame.
To remove the monitor - release the lower marquee bracket from inside the cab(four screws at the top) this will allow you to remove the bezel. There are two screws at the lower front that hold the monitor to a bracket attached to the cab, take these out. There are two others attached at the top to the rear of the cab that you can get to easily, remove these and the monitor will sit there quite happily. Don't forget to remove the audio, sync and monitor power cables attached to the chassis before you pull it out.
Good luck