As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - DURING CLIMBOUT AT FL200 LEFT ENGINE FAILED. N2 SPOOL READ ZERO. OIL PRESSURE READ ZERO. N1 SPOOL READ 20. RETURNED TO DFW AND LANDED WITHOUT INCIDENT. PER ENGINEERING REIVEW OF DFDR N2 SPOOL UNCOUPLED FROM GEARBOX. REPLACED NUMBER ONE ENGINE. SYSTEM GROUND CHECKED NORMAL OPERATION.