What was found
AFTER TAKEOFF, TRIED TO RAISE MLG, GEAR UNLOCKED ILLUMINATED FOR NLG. CYCLED GEAR PER ECAM, GEAR CAME UP & LOCKED. LANDED IN SEA WITHOUT FURTHER INCIDENT. A/C FERRIED BACK TO PHX. MX R & R MLG CONTROL MODULE IAW AIRBUS MM 32-30-00. TEAR DOWN REPORT CONFIRMS FAILURE. DURING PRE-TEST "DOWN-UP SWITCHING BY S1" TEST FAILED. SEVERAL CONTACTS OVER VOLTAGE DROPS STATED IN CMM. UNIT REPAIRED & RETESTED IAW CMM 32-31-13. OPS TESTS GOOD.