What was found
ONE MINUTE AFTER BEGINNING DESCENT FROM 40,000FT, NR 2 BLEED TRIP OFF ILLUMINATED. RESET OK. THROTTLES WERE AT 65 N1 WHEN TRIP OCCURRED. ACCOMPLISHED FIM TASK 36-10, TASK 801. TS & ACCOMPLISHED NR 2 ENG BLEED AIR SYS HEALTH CHECK IAW T/C NG-36WC-000001. FOUND NR 2 ENGINE HIGH STAGE REGULATOR FAILED HEALTH CHECK. REPLACED HIGH STAGE REGULATOR IAW MM 36-11-07-000-801 AND 36-11-07-400-801. LEAK AND OPS CHECK GOOD. ALL OTHER COMPONENTS PASSED TEST. ETOPS SIGNIFICANT GROUND VERIFICATION SUCCESSFUL. OK FOR CONTINUED SERVICE.