As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH POWER SET ON TAKEOFF NR 2 ENGINE N2 ANALOG INDICATION SHOWED APPROXIMATELY 20 LESS THAN THE DIGITAL INDICATION. ABORTED TAKEOFF AND RETURNED TO RAMP. REMOVED AND REPLACED NR 2 ENG N2 GAUGE PER AIRBUS M/M 77-12-21-4, OPS CHECKED PER ENG RUN PER JRH. NORMAL INDICATIONS FOLLOWED.