Jon,
I've had two thoughts on this so far today. One, if the load is only 1A, than maybe a TO-220 case 7908 is worth a try. However, if you need the full 1.5A that the TO-3 version gave, you could use an LM337 in a TO-3 case and program it for 8V. But, you cannot just plug the 337 in where the 7908 was, you will need to mount it remotely and wire it back.
For the heck of it, I looked and was not able to locate any 7908s in TO-3 cases anywhere either.
I just looked at my notes scrawled on the top of the RL01 with broken power supply, and it was the 7908 (-8V supply) that is toast. So, with two data points, I would now definitely suggest the LM337 route.
Lou