Monitor adjustments

[SuperDeadite]

So I got in an original monitor and runs very well.  But the picture is a bit off center in 31khz mode, and way too big in 15khz mode. 
Is there any way to adjust this?  Doesn't seem like the dials do anything about this issue.  I can see pots on the board through the vents,
Do I have to open this beast?  Hope I don't fry myself...

[SuperDeadite]

Well after getting a tiny screwdriver and pulling out a tremendous amount of dust, I found how to adjust everything I need from the front panel.
Except for horizontal size... I'm assuming it's a ferrite core like on an old arcade monitor.  Meaning probably have to take off the back cover to adjust. 
Well, screw that haha.