Looking for some help diagnosing a monitor issue (Lethal enforcers)

[Chuck D. Head]

So, I got a basically free Lethal Enforcers cab (they threw it in with a pinball I picked up). I was told it was not working, would not power up at all. I haven't looked into the specs yet, but the replacement power supply (happ) duct taped onto the top of the original had two power switches. I switched them both on and boom, it powered up and mostly works. It has no sound, which seems to be a common board issue that I feel somewhat confident in fixing.

 

The other main issue is the monitor. Gun shots register fine and the monitor is nice crisp and bright, but there is a area (right 25% of screen) that has a dark wavy distortion that basically looks like smoke rising. I can't really find any reference to this type of distortion in arcade monitors, does anyone have any insights?