what model number of Palazzo do you own?
the controller is mounted on the ceiling, and it has several 'lights' that may give a code when there is a problem. It also has an 'override' button that is used to override the controller, or actually make the motors run at full power, when a slide stops or doesn't seem to want to retract fully, etc.
Thor has some information on their website, and several youtube videos you can easily search and find show you how to do this.
There is no 'manual' why to move the slide, other than to disengage the motors via the controller, and push the slide in/out by pure muscle.
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