During my first run-through, I failed to get him until much later on. I read about the codes from somewhere, and decided to investigate
without a guide. Took me about an hour to get them all, and I could help but feel disappointed with the fact I didn't get him sooner.
I just wrote down the codes after that. No need to look up the locations.

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Jess: She'd cry if she had to drive here. And crash.
The very existence of flamethrowers proves that some time, somewhere, someone said to themselves: “You know, I want to set those people over there on fire, but I’m just not close enough to get the job done.”
- George Carlin