As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, RIGHT DUCT PRESSURE 10 LEFT DUCT PRESSURE 40. REMAINED THAT WAY THROUGHOUT CLIMB TO CRUISE ALTITUDE. GROUNDED - YES. AIR TURNBACK - REMOVED AND REPLACED #2 ENG PRSOV OPS AND LEAK CHECKED PER B737-900 AMM 36-11-04-400-801 (REF ASA LG PG 60489949). ACCOMPLISHED BLEED AIR CROSSOVER OPERATION TEST PER AMM 36-11-00-710-801. RIGHT DUCT PRESSURE NORMAL.