Gottlieb driver boards are one of the easiest to repair.
It's the MPU of the System 1 stuff (spider chips) are tough to find....
Go to this guy for *all* your Gottlieb needs! And he has both of those transistors cheap...
http://www.greatplainselectronics.com/search.asp?pg=1&stext=2n6043&sprice=&stype=&scat=