What was found
ON TAXI NR 2 ENGINE HAD AN UNCOMMANDED SHUTDOWN WITH ENG FAIL MESSAGE. ACFT GROUNDED. NR 2 ENG EEC BITE REF FIM 73-00 T801. OPS NORMAL, NO RECENT FAULTS, NO FAULT HISTORY ACCOMPLISHED FUEL SUMPING NO WATER OR CONTAMINATION NOTED. ACCOMPLISH OPS CHECK OF SPAR VALVE NR 2 ENG OPS NORMAL, REF 28-22-00-710-801. MULTIPLE ENGINE OPS NR 2 ENG NORMAL AT IDLE SETTINGS. ACCOMPLISH FIM 73-06 TASK 807 A-E 1-5 & STEP 7. ACCOMPLISHED HMU TESTS IAW MM 71-00-00, TABLE 502. PRECAUTIONARILY REPLACED NR 2 SPAR VALVE ACTUATOR IAW AMM 28-22-11-000-804 & AMM28-22-11-400. OPS CHECKED OK. AS A PRECAUTION, REPLACED NR 2 ENGINE HIGH STAGE VALVE REGULATOR REF AMM 36-11-07 LEAK CK GOOD.