What was found
CLT - FLT 220 - THE GREEN LEFT MLG LIGHT STAYED ON AFTER RETRACTION, NO OTHER ABNORMAL INDICATIONS WERE PRESENT. THE AIRCRAFT RETURNED TO CLT. THE AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE LANDING GEAR INDICATION MODULE. GROUND CHECKS OK. REF: MM 32-61-02, PAGE 402. (X)