As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH INDICATION SHOWED OIL PRESSURE FOR NUMBER ONE ENGINE DROPPING. CREW SHUT LEFT ENGINE DOWN AT ABOUT 16 POUNDS PER SQUARE INCH. LANDED TUL WITHOUT INCIDENT. SINGLE ENGINE TIME APPROXIMATELY THREE MINUTES. REPLACED BLEED VALVE CONTROL UNIT AND BOTH DEDICATED GENERATOR CONTROL UNITS FOR LEFT ENGINE. SYSTEM GROUND CHECKED NORMAL OPERATION.