What was found
DURING DESCENT, WHEN POWER LEVERS WERE BROUGHT TO IDLE FROM ABOUT 60 PERCENT N1, THE RT, N2 VALUE TOOK ABOUT 15 SECONDS LONGER TO REACH IDLE N1, N1 35 PERCENT, THEN THE NR1 ENGINE N1. REPEATED BY BRINGING THRUST TO ABOUT 60 PERCENT AND BACK TO IDLE, SAME RESULT. ACFT GROUNDED. RAN ENGINES, VERIFIED ENGINE NR 2 TOOK 15 SECONDS TO REACH N1 IDLE. PERFORMED ENGINE EXCEEDANCE CHECK, REF AMM 71-00-00. THRUST LEVER ANGLE RESOLVER ALIGNMENT TEST, REF AMM 73-21-00, CHECKS GOOD. R & R NR 2 ENGINE HMU IAW TC N8473000 & N8473001. DECELERATE TEST PASSED IAW EA 800-72, EA-16440.