As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER BOTH ENGINES STARTED WITH ISOLATION VALVE CLOSED AND AIR COND PACKS IN AUTO, RT SIDE MANIFOLD PRESS STAYED OPSI WITH ENGINE RUN UP >807. N2. REMOVED AND REPLACED RH PRSOV IAW AMM 36-11-09, LEAK CHECK AND OPS CHECK GOOD. PERFORMED TAKEOFF POWER ENGINE RUN IAW AMM 71-00-00, 36-11-09, PRSOV OPS CHECK GOOD.