What was found
RIGHT PACK BLEED OFF STAYED ILLUMINATED. BLEED TRIP DID NOT RESET PER QRH. LIGHT CAME ON BETWEEN 6000-7000 FEET BEFORE LANDING. ACFT GROUNDED. PERFORMED TASK CARD NG-36WC-00001. NO DEFECTS NOTED. DUE TO HISTORY REMOVED AND REPLACED RT PRE COOLER CONTROL VALVE SENSOR IAW AMM AMM 36-12-03-000/400-801 AND RT 450 DEG THERMOSTAT IAW B737-800 AMM 36-11-05-000/400-801. LEAK CHECK GOOD. PERFORMED ENGINE MAINTENANCE RUN -HIGH POWER 10 MIN FOR ETOPS VERIFICATION. NO R/H BLEED TRIP. PERFORMED ENGINE BLEED AIR CROSSOVER OPERATIONAL TEST REF B737-800 AMM 36-11-00-710-801. NO DEFECTS NOTED.