You know about
www.newtis.info, yes?
Check all fuses to the differnt components. If blown replace. If it reblows, try to isolate to the one bad component that is supplied by that fuse. Don’t assume anything. Once you ID the bad module, remove and re[power. (To confirm)
Haven’t spent much time in that area, but there seems to be a few things (‘head’ unit included) that might take out a fuse and shut down everything....
And hey, maybe you will be one of those that closes the loop!
GL