sorry, I didn't take a pic, insides looked the same as the pic there uploaded by @Willo3092
1. "Does your model have a slot in the rear for an SSD??." sorry - I don't know
2. "When you say " pushed tuner board back into slot" Did you press down on actual tuner and was it evident it had become misplaced?" not obviously misplaced but when I removed the silver back (facing forward in the pic above) , and pushed down on the board with the tuners, I felt some movement, which immediately gave me hope that was the issue.
3. "I have the model with SSD slot in rear and when I looked at sat tuner it appeared as if it was soldered to the board." it was the whole board itself that had slightly become unseated.
4. Why are you using a USB HDD?? because it's handy. not really a fan of opening boxes and messing with the guts to install memory. Have had no issues so far. Can quickly share media without accessing media server.
Sorry for slow reply, was so excited to get things back up and running. willobuild back up and running. it is the business.
thanks all