Stuck in overture.

[endofworld96]

I'm stuck in Penumbra: Overture episode one. I am trying to enter the code into the door for sector c, which I was reading a walkthrough because I hadn't a slight idea of what to do, so I noticed it gave me the code. I went to the door and tryed putting in the code (1731) and It didn't work. So I looked at some other walkthrough and they also said the same code. I then looked at what I need to do to get the code and it told me I had to get a piece of paper which was farther back in the game, and I had no access to. So if someone knows the code or what I can do to get this to work that would be great, I really don't feel like going to much earlier save to get that piece of paper. Thanks in advance!

~Endofworld96