As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB WITH ENGINES AT FULL POWER HAD A BLEED AIR DUCT PRESSURE DIFFERENCE OF 23 PSI. LEFT DUCT PRESSURE WAS 43 PSI THE RIGHT WAS 20 PSI. INITIAL TESTS GOOD EXCEPT FOUND PRSOV MOVEMENT VERY STIFF WHEN USING WRENCH. REMOVED AND REPLACED PRSOV IAW AMM 36 11 04 400 801, OPS CHECK GOOD. ENGINE HIGH POWER RUN GOOD IAW FIM 36 10 810 807 PAGES 5 6 AND 7.