As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT WAS GROUNDED. CLIMBING THROUGH FL180 L CSD PRESS LOW LIGHT AND L GEN OFF CAME ON RISE AND OUTLET TEMPS MAX SCALE HOT. LOW VOLTS NO FREQ, DISCONNECTED L CSD. THE APU WAS PREVIOUSLY PLACARDED INOPERATIVE PRIOR TO FLIGHT. THE FLIGHT DECLARED AN EMERGENCY AND RETURNED TO FIELD DFW WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED L/H CSD GENERATOR PER MM 24-20-01. OPS CK AND LEAK CK GOOD.