In the case of a user who neglects to properly narrowband their equipment

Yes. FCC Rule 90.427, Precautions Against Unauthorized Operation covers this issue. EWA has drafted for use by wireless sales/service providers a Customer Radio Programming Release Form that can be used in this situation. It should be noted however, that the form only serves the purpose of drawing your customers’ attention to the fact that they need licenses for the devices you are maintaining. The document itself does not remove your responsibility, but it helps to alert the customer.

Question: 

In the case of a user who neglects to properly narrowband their equipment, could a wireless sales/service provider be held liable for programming radios with frequencies that the customer is no longer authorized to use?

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