Originally Posted by Jack_Simth
Combination for something with numbers, generally. Likely points to look at in the observatory.
Ah, here we go; three basic things to check for:
1) Numbered volumes on the shelves. The three numbers being buttons, essentially.
2) Listed degrees in the observatory.
3) Numbered cubbies in the study.
Basically, look around the mansion for anything with numbers on it, and check that sequence to see if anything comes loose.