I found this page for PGM 3 repair. It is in Japanese, I tried to auto translate and you can probably figure it all out if you're patient. Now, if someone could properly translate it, that would be much better. Basically it shows you how to repair the PGM3 if you fried it because your valves were sticking. Here's the link:

http://nsr250-se.hp.infoseek.co.jp/kaizou/pgm/newpage1.htm