Doom Communication (stuck)

[Matt D]

STUCK: I am stuck on the part where you need to press three different symbols. One red one blue and one green. They are in seperate room where the top level is red the next level down is green, and blue is at the bottom. I been here for weeks. I stop playing because I can't find the right combonation. please someone help me and send me the right code.

[Sam Fisher]

Here's a walkthrough for that:

 

Walkthrough

[Crow_Nest]

I don't really rember how to do this cos i haven't played this level for al long long time, but i manage to get the power back online. but i also can't get the code right. SO CONFUSING!!!