There is a Facebook group for the µBITx in addition to the BITX20 list that represents the primary source of news articles on this website.
One of the members of the Facebook Group (Ufi Auttorri) has produced a diagnostic guide for constructors who are facing problems with their µBITx. While it is still a work in progress, and won’t cover all issues arising with the rig, it is an excellent starting for constructors who have run into issues. You can find it here:
https://drive.google.com/file/d/1PBK-cdn4-9EunFHl2bXBSUnx1RFP9Z_f/edit