What was found
CREW REPORTED LT N1 PLUS OR MINUS 5 PERCENT UNCOMMANDED POWER ADJUSTMENTS DURING FLIGHT, N1, ITT, N2 AND FUEL FLOW ALL UNCOMMANDED MOVEMENT. UNABLE TO SET AND MAINTAIN POWER SETTING AT HIGHER SETTING. NO ISSUES AT IDLE. CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT, R & R LT FAN INLET TEMPERATURE, T2, SENSOR AND PERFORMED CHECKS IAW AMM. ACFT RELEASED FOR SERVICE.