What would cause a hydraulic pump (for convertible top operation) to fail?

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I recently took my car to the dealership for a different service (replacement of the auxiliary heat pump) and drove into the service bay with the convertible top down before closing it to leave the car for the heat pump replacement work. When I returned to retrieve the car after the completion of the auxiliary heat pump replacement, I attempted to operate the convertible top to open the top when preparing to leave the dealer's service center and it would not open. After an inspection and diagnostic test by the technician at the dealer's service center they claimed the hydraulic pump was no longer working and needed to be replaced. The car is a 2012 BMW 650 with 38K miles. What are the possible causes for the hydraulic pump to fail without warning or intervention/use? Can an electrical surge or short by improper connection of service center equipment be a potential cause (or something similar)?