As there have been postings of recent photos of the aircraft, commenting on the surface marks visible at the base of the rudder, it may be noted that the aircraft seems to have had a repaint and different livery, including the rudder, applied some time in May/June.
May 2015 - old livery. Marks visible.
Photos: Airbus A321-231 Aircraft Pictures | Airliners.net
June 2015 -new livery, no marks visible
Photos: Airbus A321-231 Aircraft Pictures | Airliners.net
October 2015, 10 days before accident flight, marks there again on the new livery
Photos: Airbus A321-231 Aircraft Pictures | Airliners.net