The auto level data is stored in the eeprom.
To clarify my previous statement,
If you do a
G29 ; probe bed level
G28 ; home all axis
G29 will perform the bed levelling ans store the results in the eeprom
G28 will home Z and this will reset the bed levelling data
so use
G29
G28 X0 Y0 ;home X Y
G1 Z0 F5000 ; move Z to 0
To clarify my previous statement,
If you do a
G29 ; probe bed level
G28 ; home all axis
G29 will perform the bed levelling ans store the results in the eeprom
G28 will home Z and this will reset the bed levelling data
so use
G29
G28 X0 Y0 ;home X Y
G1 Z0 F5000 ; move Z to 0