What was found
DUCT SPLIT NOTED DURING CLIMBOUT. RT 20/LT 44 PSI AT LEVEL OFF LT REMAINS CONSTANT & RT CLIMBS STEADILY TO 44 PSI. ACFT GROUNDED. ACCOMPLISHED T/C NG-36WC-00001 NR 2 ENGINE HEALTH CHECK. REPLACED NR 2 ENGINE PRE-COOLER CONTROL VALVE OPS/LEAK CHECKED GOOD REF AMM 36-12-02. PERFORMED BLEED AIR OPS TEST AND REPAIR CONFIRMATION REF MM 36-11-00-710-801, FIM 36-10-00-810-807. NR 2 ENGINE OPERATES WITHIN CHART LIMITS, NO DUCT PRESSURE DISPARITY NOTED.