I assume it is talking about the normal status recording the ECM (engine computer) does. A history of error codes and associated data, plus things like engine hours, maximum speed achieved, etc. It would be displayable on a suitable equipped computer that can read from the engine data bus, and you could perhaps request a printout. Most likely you would be charged for a diagnostic session, at whatever rate and minimum time the chassis dealer chose.
Most routine maintenance is not logged, i.e. it doesn't know when an air filter is changed or a belt replaced. You didn't mention the chassis type (Ford E450?), but what you could get s what Ford (not Winnie) decided was good to record.
The other type of service data recorder is an add-on black box used to gather real time data while the engine is running. It is plugged in and used when intermittent problems occur and the data needs to be captured on the fly.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL