hello friends I have a forklift Still, EGV 14 which raises no nails, but if due to lower, back and forth normally, but when he sends raise does not respond, has changed the hand- and this is not the problem has been revised Combi Sem 1 module, and nothing has been found damaged, could someone give me some idea what I could be wrong on this computer, if anyone has had this type of failure, or had wishlist this stacking faults'll be very grateful...