I pretty sure all Classics in this model year had hydraulic disc brakes. Your actuator will be located in a compartment on the street side just aft of the hitch and if like mine forward of the compartment that has the water hook up, black tank flush hook up and the water output valve. If you have to replace the unit with a Dexter its about $725 for the part.
Dexter Electric Over Hydraulic Brake Actuator (1,600 psi) Dexter Trailer Brakes K71-651
However, if the Actibrake is leaking then the recall should pay for the replacement.
Vogt RV in Fort Worth looks to be your closest Airstream dealer. I bought my preowned AS from them and they performed the recall work for the actuator and brake lines.