What was found
NR 2 BLEED TRIP OFF LIGHT ILLUMINATED AT 15000 ON CLIMBOUT. PERFORMED CHECKLIST IAW QRH. BLEED TRIP OFF LIGHT EXTINGUISHED, BUT ILLUMINATED AGAIN AFTER ABOUT 5 SECONDS. ACFT GROUNDED. ACCOMPLISHED BLEED AIR HEALTH CHECK IAW T/C NG36WC00001. PRECOOLER VALVE FAILED TO MOVE TOWARD OPEN POSITION UNTIL PC WAS DROPPED TO 0 PSI. REPLACED PRECOOLER VALVE IAW MM 36-12-02. LEAK AND OPS CK GOOD. NO OTHER DEFECTS NOTED. ACCOMPLISHED REPAIR CONFIRMATION IAW FIM 36-10 TASK 801, NR 2 ENGINE REPAIR CONFIRMATION SUCCESSFUL.