Thanks Marian. I ended up just going one by one on the lock and got the lock opened pretty quickly. Saved and then reloaded a prior save to see if the answer made sense. It did NOT so I'm just moving on. I'll look at the hints to see, but I don't really need the info now.
So, I looked at the UHS hints and went back in the game and tried it out and I don't know how anybody could figure that out. Then, you still don't know the actual code, so I read more hints which told me to read the diary. First, I didn't notice an entry being made to the diary. Second, I rarely look at the diary so...
Anyway, I'm glad I was able to get the answer by trial and error as some games don't let you do that. Even if you hit the right answer you have to actually hear or see the clue (in some games). And thankfully, it was only 3 numbers and not hard to go through them.
I'm wondering how much I used the walkthrough the first time I played this game or if I've gotten more dumb since then. The game is giving me problems!