What was found
CLIMBING THROUGH 21000 FT NR 2 ENG BEGAN SURGING AND N1 WENT INTO RED ARC THRUST WAS REDUCED AND ENGINE INDICATIONS WERE NORMAL THROUGH LANDING PERFORMED EEC BITE CHECK PER MM 71-00-00-700-808-F00. FAULT CODE 73-20332 LOGGED ON NR 2 ENGINE. PERFORMED ENG EXCEEDANCE CHECK PER MM 71 00 00. 740 801 FOO. INSPECTED NR 2 ENG INLET & EXHAUST PER MM 71-00-00-800-804-F00 ITEM D1B. NO DAMAGE NOTED. NOTE ENG EXCEEDANCE PAGE INDICATED PEAK 104.9 RED 104.0 DURATION 0:00.6 PERFORMED BOROSCOPE INSPECTION OF THE STAGE 4 LPT BLADES NO DAMAGE NOTED M/M 72-00-00-200-809-FOO PAGE (7) (5)(5). ACCOMPLISHED FIM TASK 73-25-00-810-802-FOO. COMPLIED WITH EA 800 72EA 02784 STEPS 4 5 6 AND 7. REPLACED HMU REFERENCE AMM 73-21-10-400-801-F00. ACCOMPLISHED IDLE POWER LEAK CHECK. LEAK CHECK GOOD REFERENCE AMM 71-00-00-700-801-F00. ACCOMPLISHED ACTUATORS TESTS NO FAULTS NOTED REFERENCE AMM 71-00-00-700-807-F00 AND ENGINE RUN EEC BITE CHECK REFERENCE AMM 71-00-00-808-F00.