CONTAINS SPOILERS

1. Enter the Royal Stables. 2. Once inside the Estate of the Master of the Royal Stables go left into the Rosetta Stable Code. 3. All of the symbols you'll need are painted on the wall (see image). 4. Go back to the Royal Stables and enter the Labyrinth. 5. Enter the doors according to symbol and color from the Rosetta Stable Code. 5. This will give you access to the Servo-Horse Stable.