So to fix the overscan I may need to open up the unit and mess with the boards within?...

Hello. I need help opening the service menu on a Panasonic TC-59R62
Its an old CRT with bad overscan. The top left of the screen is cut out and I need to adjust it. Ive tried multiple methods online ie, holding volume down on the TV then pressing recall (with the 30m timer as well). Nothing I have tried has been able to bring up the menu if there's one at all.
Or is there an adapter I could use to fix this? Trying to use the TV for old retro games but again the top left of the screen is cut out and cant see anything displayed there.

Hello. I need help opening the service menu on a panasonic TC-59R62
Its an old CRT with bad overscan. top left of the screen is cut out and i need to adjust it