What was found
WHEN N1 IN NR 1 ENGINE INCREASED OVER 75% IN CRUISE, 1 HP ENTERS AMBER RANGE. IN CLIMB ENTERS AMBER FOR A FEW SECONDS, GOES BACK IN GREEN AND BACK TO AMBER. MECH ENGINE PROB, NO EMERGENCY DECLARED. RESCUE FLT 9860 SENT TO PROTECT "TRANSFERRED TO NRWC 664-CMH-04960"-C/A-SEE NRWC NR 664-CMH-04960 FOR CORRECTIVE ACTION TAKEN. R & R LT ENGINE COMPRESSOR VIB SENSOR, IAW RR MM 77-41-10.