Quoted from msj2222:
I just dont understand why the problem would escalate by just reflowing. Is there a way to verify its a bad pot? Are the the ohms printed on the top?
Even touching the adjustment part of the pot if it's going/gone bad would create effects on the screen (lines, etc) I'm not sure if those numbers in your pic 52, 25 are the values and i don't have my machine any more to confirm for you. Do you know what type of monitor and board you have in the machine? usually they are either Wells Gardner or Ducksan. From your earlier pic showing most of the remote board it looks like it may be a Ducksan. There will be others in the club who can confirm what value pot you will need. The 52 "could" stand for 520K but i can't be positive on that.