I heard there was somewhere you could get a new board, but i don't know where or how.
http://www.chiefdelphi.com/forums/at...1&d=1198128370
as for the regulator... you probably want a 78L05, which is the exact same as the one on the board. assuming yours is bad of course. I have no idea where to get one. I looked at radio shack, but they did not carry it here. Ok to test if your regulator is bad ... apply standard voltage and use a multimeter to see if 5 v is coming out one end of the regulator pins. I think you will want to test the two outer pins, but i can't remember. by touching one of the pins on it, and one to ground you should detect the input voltage too. therefore detecting if voltage is even reaching the regulator.
...on the wild side... maybe your LED's are backwards. In that case your board may be fine, but not lighting up. you can easily test this by getting a good led and bridging it's leads across one of the other LED's. If your LED's are backward this test should light up the LED (assuming that LEd is not backwards itself, but you can try the LED both way's)
I know I've kid of babbled here, but I hope it helps anyway.