Contra Konami arcade cabinet Sams Town - $800 (Placerville)

Original Contra Konami cabinet.
This is the cabinet that was at Sam’s Town in Cameron Park CA.
It’s in pretty decent shape overall.
It does have some slight damage to the particle board on the bottom of the sides but it’s not bad.
Plugged it in about 4 months ago and the screen turned on and displayed the contra image.
The screen was flickering a little.
We turned a knob on the back of the monitor and the image got better but it still flickered.
The sound was also working.
Just plugged it in a week ago and the screen was black.
The sound seemed to not be working either but we were also twisting the volume knob.
The knob might just need cleaning.
Was told a cap kit might fix the screen issue but I really don’t know very much about arcade cabs.
I’d consider a trade for a Honda xr80 or something similar but not smaller.
ATM were firm.
Also I guarantee it’s the original cab from Sam’s Town.