As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER CONFIGURING FOR A BLEEDS OFF TAKE OFF WITH LT & RT BLEEDS OFF. APU BLEED OPEN, LT & RT PACKS IN AUTO, AND ISOLATION VALVE CLOSED, RT DUCT PRESSURE SHOWED 18 PSI. ACFT GROUNDED. FOUND NR 2 ENGINE PRSOV CONNECTOR DISCONNECTED. RECONNECTED CONNECTOR AND PRSOV TEST NORMAL IAW AMM 36-11-04. RUN NR 2 ENG ALL BLEEDS NORMAL.