There are no manuals for the Imperial Valet controller. While this is one of the grand battleships of lawn sprinkler controllers, it is no longer economical to repair, since the motors that make it operate are no longer commonly available. As long as the sprinkler zone valves are not Imperial brass valves, you can use another, less expensive controller to replace the Imperial.
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Of course, even if you were prepared to pay a professional to repair the controller, no one can make a recommendation, since your location is an unknown.