FYI I send an email to btmine about the issue of damaged/nonworking units and he replied very quickly.  He told me that I can ship my damaged hashing board by itself back to btmine in China and they will send a new replacement board back.  I am sure it will take a week round trip, but that allows me to keep my working 100Gh/s up and running and avoids having to pay a huge shipping cost (shipping the board should not cost nearly as much, but I have not investigated that yet).