kubota L5740 HST mode does not work

[weldsaidi]

hello my friends
I have a tractor kubota L5740 , year 2009, that has a problem in changing the speed of a slow and speed mode. it is only in the slow mode, the buttons change the mode does not work, the cruise lever mode does not work.
this problem of the driver was entering menu and changed the parameter in K, L, M and N and up maintenenant I unable to make any chause.
Please help me.
thinks

 

[Wowvickwow]

Hey just wondering if you ever found what caused the hat buton not to work? I know its been a while but my tractor did exactly the same since im out of warranty wanted to fix it my self