As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT MLG DOOR OPEN AFTER T/O AFTER RETRACT. SWITCHED POS DET TO SYS 1 WITH SAME INDICATION ON ECAM DOOR LIGHT REMAINED ON OVERHEAD. REMOVED AND REPLACED RT GEAR DOOR SWITCH 28GB IN REF TO A300-600 AMM 32-00-00-4. PERFORMED LANDING GEAR INDICATION FUNCTIONAL TEST MULTIPLE TIMES REF A300-600 AMM 32-61-00-5. ALL INDICATION NORMAL AT THIS TIME.