As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK, AFTER TK-OFF LANDING GEAR HANDLE IN UP POSITION AMBER GEAR DISCREET LIGHT ON AND EICAS GEAR DISAGREE MSG. QRH PROCEDURE COMPLETED AIR TURN BACK TO SLC. R&R NOSE LANDING GEAR RETRACT ACTUATOR PER AMM 32-34-01 UP TO AND INCLUDING STEP F.(13)(C)