What was found
DURING CRUISE, AT 27,000 FEET, GEAR INDICATIONS APPEARED ON THE EICAS WITH AMBER DASHED LINES FOR NOSE GEAR FLUCTUATING THEN CAME ON SOLID RED THEN GEAR DISAGREE MESSAGE APPEARED ON EICAS CREW REPORTED GEAR RETRACTION HAD BEEN NORMAL, AND AFTER FOLLOWING QRH THE GEAR INDICATIONS WERE NORMAL. LANDED WITHOUT INCIDENT, NO OTHER MESSAGES NOTED. THE ACFT RETUNED TO DEPARTURE, MX REPLACED THE NLG NR 2 DOWNLOCK SENSOR AND WIRING HARNESS.