What was found
CLIMBING THROUGH 12000 FEET, NR 2 N1 LAGGED TARGET N1 BY 4%. MANUALLY ADVANCING THRUST LEVER HAD NO INCREASE IN N1, SPLIT GRADUALLY DECREASED AND MATCHED TARGET N1 AT 30,000 FT. NO OTHER LIGHTS OR ABNORMAL INDICATIONS. AT 12000 NR 1 N1=94, NR 2 90, AT 17K, NR 1=96, NR 2-93 20K, NR 1=99, NR 2=98, 30K NR 1=100, NR 2=100. REMOVED AND REPLACED THE NR 2 ENGINE HMU AND FUEL PUMP IAW MT 773-11-00.