What was found
RIGHT ENGINE DID NOT REDUCE TO IDLE ON INITIAL DESCENT, FL370 - 11,000, CORRECTED ITSELF FOR FINAL DESCENT N1 53.0 & N2 80.9, FF 1.2. REMOVED & REPLACED THE RT ENGINE MEC IAW AMM 73-21-01-404-032-G00, UP TO STOP 2E(14)(C) COMPLETED UP TO STEPS 2F(9). COMPLETED 73-21-01-404-032-G00. PERFORMED TEST 5,6&11 OK FOR SERVICE. LEAK CHECKED OK.