As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6604 - PHX-LAX, AFTER TAKEOFF, PILOT RECEIVED A GROUND LIFT DUMPING UNSAFE CAUTION MESSAGE. FOLLOWED CFM PROCEDURES AND RETURNED TO PHX WITH NO PROBLEMS. MAINTENANCE RESET SYSTEM AND FOUND NO DEFECTS. AIRCRAFT CONTINUED ITS FLIGHT WITH NO FURTHER DIFFICULTIES RELATED TO THE OCCURRENCE. (M)