In all honesty - you have nothing to lose. The RAMs are the first chips that will be affected by any corrosion... the sockets may have saved the actual IC's from being ruined, but they might just be floating due to the traces being eaten away.. so any RAM settings would be lost already.

IF you have corrosion then it needs to be fixed up before it gets worse - mine didnt look too bad, but once the green film was taken off the board to reveal bare traces it was astounding just how far the rot had travelled.
IF the RAMs are eaten away, i have some 6514 here and 2114 are easy to come by... seem to be on every arcade board from 80's era

Am i right in assuming that your board boots sometimes on the bench but not in the game?

Yes i have had the board boot on the bench, but have had no luck with it in the machine.
when 5v from the computer supply is connected to the 5v pin at CN9 ( i think ) the power goes through a diode and comes out at 4.33v.
when connected to the machine power supply it gets 5.8v and comes out, i think at 5.6v. and wont boot.
On the bench sometimes the LED would flash on and off for ages and then would stay on for a second or two then start flashing again.

Ian