hi margus. im guessing that machine is similar to a hyster rp2.0 in which case its got azappi eps controller on it.code 79 or al79 means incorrect start,but dont take that too literaly.when does this fault occur?if the truck is used in moderatly bumpy conditions you will have a load of trouble with connectors comming loose ,wires breaking inside the sheathing,components shaking loose on the eps controller,main contactor contacts,keyswitch wires braking...to name but a few