What was found
RIGHT ENG N1 INDICATOR FLUCTUATED FOR ONE MINUTE DURING CRUISE FLIGHT FROM 97 DOWN TO THE LOWER 50S. ALL OTHER INDICATIONS NORMAL. DID NOT SWITCH EICAS COMPUTERS OR TURN ON STBY ENG INDICATORS DURING THE FLUCTUATIONS. INSPECTED RT ENGINE N1 TACHOMETER TRANSMITTER IAW AMM 77-12-01-216-005-G00. NO FAULTS OR DEFECTS NOTED. REMOVED THE CONNECTOR, CHECKED AND CLEANED THE CONNECTOR AND REINSTALLED. CHECKED OK IAW AMM 77-12-01-216-005-G00.