There are typically 'keys' that come are supposed to come with the deck - these slot in between the deck and the cage around it and release the unit. If you have a shop install it, they usually don't leave you the keys, not sure why... Where did you buy it? Your warranty may include removal of the unit if they installed it.
I worked at A&B Sound ages ago and we would remove a faulty deck for a customer as part of the product/install warranty.
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