Rear axle differential lock message

[Mnite_S63]

Had this problem a month ago and they found one of the plugs to the control unit was corroded.

They cleaned it up and sprayed ul. Took it for a quick drive yesterday as its a garage queen and 25 miles later the error came up.

Error comes off after I turn the car on and off but had came back prior.

Anyone had this type of problem before?

Thanks