What was found
DURING CLIMB, RT DUCT PRESSURE INDICATED 5 PSI. ACFT GROUNDED. ACCOMPLISHED NR 2 ENGINE HEALTH CHECK T/C NG-36WC-00001. REPLACED HIGH STAGE REGULATOR IAW AMM 36-11-07. INSTALLATION TESTED GOOD. CROSSOVER TEST PASSED, IAW AMM 36-11-00-710-801. RAN NR 2 ENGINE AT 80% FOR ADDITIONAL 5 MINUTES AND RIGHT DUCT PRESSURE WENT TO 10P SI AFTER CYCLING BLEED AIR SWITCH. REMOVED & REPLACED THE NR 2 BLEED AIR REGULATOR, IAW AMM 36-11-03-000-801 & AMM 36-11-03-400-801. RAN NR 2 ENGINE AT 80% & CYCLED BLEED AIR SWITCH. DUCT PRESSURE WENT TO 8 PSI WITH SWITCH IN OFF POSITION AND CAME BACK TO 48 PSI WITH SWITCH ON. CYCLED SWITCH 5X AND DUCT PRESSURE RESPONDED ACCORDINGLY. OPS CHECKED GOOD, NO FURTHER DEFECTS NOTED.