Holy moly that's like just swapping each subunit with a new one cost. Did you actually get new enclosures or did they replace the guts inside the old enclosures?
Mine just gets the USB connected fault but seems to be detecting regardless - can't see/change settings. Be nice to know which module is at fault at least. I suspect the CTX has two processors - one in each module and if I knew what it is in the display module I could fix the board. Looking forward to when faulty detectors are available cheap so I can figure this stuff out. Now though I just want it working as I'm stuck with a EQ800.
Btw, I did see replacement displays for sale on that auction site.