You'll need all three MO Discs to rescue Chris.
They are located:
- Behind the tiger statute on the first floor of the mansion, near the very first zombie you encounter. You'll need the yellow gemstone, which is located on the second floor, in the room with the moving eagle statute.
- On a desk in the laboratory, outside the room with the projector.
- In the room with the projector, you'll need to unlock it using a computer in a medical looking area on B-3. (the previous MO Disc is outside this room)
Username: John
Password: Ada
Password 2: Cell
You'll then need to use the suspiciously GameCube looking devices to send the information to a triple locked door. Each device can be used only once.
- The first is in a room unlocked by the computer mentioned above on B-3. You'll find a few items in this room along with the GameCube like a Projector Filter. Remember this room, you'll need to come back later for other reasons.
- Another is in a power storage room, though it looks more like a freezer. You'll need to climb through various vents and kill a few bug like creatures to find it.
- The last is after the stream room where Jill must deliver the fuel capsule (filled with nitrogen), where you must walk. Head straight after entering and it will be tucked in against the wall.
After you sent all data, you can open the area to the cell where Chris is, but you won't be able to free him until
Thanks
Chronik Killer for assisting with the location descriptions, and
TopherXPwns for verifying there's only one password.