forgot my channel blocking code

I have a Phillips Magnavox pr1903c125 that I haven't used in like a year and a half. I had channels 3 and 4 blocked so my brother couldn't play my video games when I wasn't home. But now, I've forgotten the channel blocking code, so *I* can't play video games. Is there anyway to fix or get around this without taking it to a repair place? All my money is going to a Wii this weekend so I won't have the money to take it to a repair place...