What was found
AT TOP OF DESCENT, AS THRUST LEVERS RETARDED, NR 2 ENGINE BLEED TRIP OFF LIGHT ILLUMINATED. LIGHT EXTINGUISHED WHEN TRIP RESET WAS PUSHED IAW QRH PROCEDURE. PERFORMED PRELIMINARY CHECK REF TASK 36-10 TASK 801. CHECKED HIGH STAGE VALVE & FOUND TO BE IN NORMAL POSITION & MOVES FREELY. PRECOOLER VALVE ALSO IN CORRECT POSITION, KISS SEAL SERVICABLE. IAW SEAM C REPLACED PRECOOLER VALVE SENSOR, REF MM 36-12-03-000-801 & 36-12-03-400-801. LEAK CKD NORMAL. VERIFICATION FLIGHT SATISFACTORY.