They are red and blue.
I had to lookup what a broadcast code is, and upon removing the blue cover from my PCMs "chip" I found there are no letters in my code, only numbers. the full code is:
4061...

Have an handfull of oddball problems on a 94 k2500 Suburban and Id like to snag a PCM or 2 from the scrap yard for testing purposes.
The current PCM in the truck has no serial/part numbers aside...