As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING LEVEL OFF, A FL290 WE HEARD BANGING FROM THE RIGHT SIDE OF THE AIRCRAFT (IN ICING CONDITION W/ENG A/I ON) THIS WAS FOLLOWED BY AN ENG 2 STALL ECAM. LOOKING AT ENG 2 N1 WE OBSERVED SLIGHT OSCILLATION, THEN THE ECAM WENT AWAY AND ALL ENG 2 PARAMETERS RETURNED TO NORMAL. THE ENG 2 STALL LASTED APPROX LESS THAN 5 SECONDS. / "