What was found
DURING CLIMB OUT AT 7000 FT, NOTED DUCT PRESSURE SPLIT. N1 LEFT 95.7, RIGHT 95.7. N2 LEFT 99.3, RIGHT 99.0. DUCT PRESSURE LEFT 40 PSI, RIGHT 28 PSI. AT FL400 LEFT 35 PSI, RIGHT 22 PSI. ACFT GROUNDED. TROUBLESHOOTING ACCOMPLISHED, IAW FIM 36-10-00-810-807 AND AMM 36-12-00-700-801. FOUND PRE-COOLER CONTROL VALVE FAULTY. REPLACED PRE-COOLER CONTROL VALVE IAW AMM 36-12-02/401. PERFORMED OPS CHECK, REF ENGINE BLEED CROSSOVER CHECK IAW AMM 36-11-00-710-801. ALL PRESSURES NORMAL. ALL WORK PERFORMED ON NR 2 ENGINE.