[CA11] RD418D stop working / context number

[esteller]

My brand new RD418D (model E92129) stop working after two months. It was working great till last week.
It warms up ok. Then it sweeps onces and it goes black. After reading some posts on the forum the general suggestion is to check voltage on dome and wire continuity.
Before I do that I would like to know the meaning of the context number that shows during the warm up pop up window and on the radar display. It shows on the MDF next to the range box. May be the radar is telling me what is wrong and I can't understand it. I'm going to try to post a pic with the number inside red ovals.
I've seen different values and letters, but note that I have a negative value on this box now. What is this number?
Any help beside checking voltage, cable, disconnect and reconnect the radar?

Thanks!