NTSC SNES graphics issue

I have just picked up an NTSC SNES and it has a slight issue. As you can see in the attached screenshot, the screen is slightly distorted and also occasionally rolls a little. I am using an RCA cable. It is a first edition large PCB SNES. Does anyone know what might be causing this? It's not the power supply as I tested a spare and got the same result. Thanks.

 

Just to add, it's also definitely not an issue with the RCA cable or the TV as I have another identical SNES which works fine.

 

Colour bleeding. This one might be capacitors I think.

Any of the chips getting overly hot? does it fix itself when pressure is placed upon them?

 

Thanks for the suggestion, I guess I'll have to open it up and take a look. Will the capacitors be leaking it they're the culprit? Do you know which capacitors relate to the graphics?