As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AFTER TAKE OFF LANDING GEAR LGCIU 2 FAULT MESSAGE ON ECAM. AN EMERGENCY WAS DECLARED, AND THE AIRCRAFT RETURNED TO DFW WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT. REPLACED #2 LGCIU (INITIAL REPORT AALA202108131019) AND THE LANDING GEAR DOOR SELECTOR VALVE PER AMM 32-31-71 & 32-31-00. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.