What was found
NR 2 BLEED TRIP OFF LIGHT ILLUMINATED DURING DECENT WITH THROTTLES REDUCED POWER, NR 1 DUCT 30 PSI, NR 2 DUCT DUCT 12PSI. RAN QRH, COULD NOT RESET. ACFT GROUNDED. COMPLIED WITH PRECOOLER CONTROL VALVE HEALTH CHECK, OPS NORMAL IAW 36-12-00-700-802. R & R NR 2 ENGINE PRECOOLER CONTROL VALVE SENSOR, LEAK CHECKED GOOD IAW AMM 36-12-03. RAN ENGINES TO 60 N1, NR 2 DUCT PSI AT 33 PSI. NO BLEED TRIP LIGHT. R & R NR 2 ENG PRECOOLER VALVE REF AMM 36-12-02. R & R BLEED AIR REGULATOR, OPS CHECKED NORMAL, IAW AMM 36-11-03-008-801. RAN BOTH ENGINES TO 65 N1, BLEED AIR PSI WITHIN LIMITS, NO BLEED TRIP, REF AMM 36-10-00-810-801.