As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PER CREW LEVEL OFF AT 10,000 LOW FLOW , UNABLE TO PRESSURIZE NORMALLY. RETURN TO FIELD . BOTH CONTROLLERS RECORDED FAULT " LO INFL / HI LEAKG ". FOUND RECIRC AIR, AND BLEED AIR SWITCHES ON OVERHEAD PANEL TURNED OFF INSTALLED NEW GROUND CONDITIONED CHECK AIR VALVE. COMPLETED CONDITIONED AIR CHECK VALVE SEPARATED AT HINGE. ALL OPS CK''S WERE NORMAL. PRESSURIZED AIRCRAFT TO 3 PSID. NO LEAKS. PRESSURIZATION NORMAL