As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB OUT RIGHT DUCT PRESSURE ROSE AS HIGH AS 55 PSI . PRESSURE SPLIT WAS 15-20 PSI BETWEEN L AND R DUCTS. GROUNDED - YES. ON DEFERRAL. PERFORMED B737-900 FIM 36-10 TASK 803 STEP F TO LEAK CHECK SENSE LINES AND FITTING. FOUND PRSOV LEAKING AT THE CASE HALF. REMOVED AND REPLACED #2 ENGINE PRSOV PER B737-900 AMM 36-11-04. LEAK CHECKED AND OPS CHECKED GOOD. PERFORMED ENGINE BLEED AIRCROSSOVER OPS TEST PER AMM 36-11-00-710-801. DUCT PRESSURE ALL NORMAL AND WITHIN LIMITS ATALL N1% INTERVALS.