As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 1206, IND TO MKE. AFTER TAKEOFF, THE CREW SELECTED THE GEAR UP AND RECEIVED A 3 RED INDICATION SHOWING DOWN IN ADDITION TO LG LEVER DISAGREE ON EICAS. THE QRH WAS FOLLOWED AND THE FAULT DID NOT CLEAR. THE AIRCRAFT RETURNED TO IND AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LGEU AND PERFORMED OPS CHECKS WITH NO FURTHER DEFECTS NOTED.