I just noticed this in the very last entry in the
Egypt guide; the one on James Vaughn's Command Center:
After much frustration, I solved it old school: Pen and paper, I wrote down which switches opened which doors. This helped to narrow down the combination. There were no complex order involved, I found a combination of up to four switches that opened the doors one or two at a time.
Men. Always the hard way.
Here's the easy way:
Look at the arrangement of floor switches as number pads with the number 1 at the top left; same as on a phone.
In the house above you can find 3 different number sequences. One you get from taking a book from a bookcase; one you get from using the toilet and the third you get from turning on the stereo (if a family is living there and has the stereo on you need to turn it off then on again). Write them down.
Now you can just enter those 3 combinations on the "number pads" of floor switches. As I recall it's pretty obvious which number sequence goes with which room because not all "numbers" are active in every room.