Have a 210LX Link Belt excavator serial number k3j36002I have owned this machine for about 5 years having trouble with pass code,tried to start it today and the only way it will stay running if you hold in starter button as soon as you release it engine stops.At the same time enter pass code comes up on screen but I donot have the pass code Other times this would come up I would just put in some random numbers and it would clear itself and be fine.This time a error code comes up.Is there a way that I could change pass code on this machine,read in owners manual that all it says is contact your dealer to change also read in this fouram about how to clear error codes and it didnt work