As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BLEED OFF ENG L APPEARED AT IDLE PWR PRIOR TO TAKEOFF. RESET UNSUCCESSFUL. IDLE POWER SNAPSHOT SHOWS HPSOV CLOSED AND PRSOV CLOSED. ADVANCED POWER TO 80 PERCENT CYCLED BLEED SWITCH, PRSOV OPENED DUCT PRESSURE INDICATED 4 PSI. PRSOV & HPSOV BOTH CLOSED AT IDLE. COMPLIED WITH MEL. REPLACED PRSOV PER MM. OPS CK PER MM AND JRH OPS CHECKED GOOD.