What was found
AFTER TAKEOFF RIGHT DUCT PRESSURE FLUCTUATED BETWEEN 62 AND 67 PSI. DIFFERENTIAL BETWEEN L AND R DUCT PRESSURE > 20 PSI. CLIMBIMG THROUGH 18,000 FEET, BOTH DUCT PRESSURES NORMALIZED. L DUCT STAYED 38-45 PSI. R DUCT WAS ABOVE 60 PSI AT CLIMB PWR FOR ABOUT 5 MINS. GROUNDED - YES. PERFOMED FIM TASK 36-10. 803. FOUND #2 ENG PRSOV IN THE OPEN POSITION, UNABLE TO CLOSE. REPLACED PRSOV REF AMM 36-11-04-400-801. OPS CHECK GOOD, NO OTHER DEFECTS NOTED. PERFORMED BLEED AIR CROSSOVER TES REF AMM 36-11-00-710-801, OPS TEST GOOD.