As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUCT PSI FROM ENGINES SPLIT DURING TAKEOFF OR CLIMB, WITH LT & RT ISOLATION VALVES CLOSED & BLEED SWITCHES ON. LEFT 52 RT 40 SFC TO 20000'. L48 R39 THRU 28000'. EVEN 40 PSI 30000'. RAN ENGINES AT POWER CHECKED SYSTEM. FOUND FAULTY PRSOV, REPLACED PER MM. ENGINE RUN WAS GOOD.