Since no one has chimed in, I might as well post an update for anyone having similar problems. Maybe my information will be of help to others.
So, I took the faulty miner apart and pulled the controller boards - both the green and black board that fit together.
Looking at the black board, I noticed it had what appeared to be melted plastic on the back side. I would post a picture but too much trouble.
So I pulled another S9 that only has two boards hashing and I swapped out the controller - both green and black board - and put them into the original miner with three good boards.
Fired it up and it's now been hashing for 40+ minutes. It would have shut down in that time frame before.
I guess I need to get another black board to put back into the two-board miner.
Does anyone know if Bitmain Warranty or Bitmain themselves will sell a black controller board for a 600Mhz miner, 12.93TH? Of course it's a non-autotune.
For now, just happy I was able to get a complete three-board miner back on-line and hashing.
Also, if anyone reading this has a black S9 controller card they would like to sell, drop me a PM and we may be able to work something out.
Thanks for reading. :-)
BITMAIN WARRANTY should be able to help you out. They've successfully resolved issues I had with two different S9's.
On a side note, I am surprised you had an issue with the controller. The only time anything like that happened to me was about a month ago and the issue ended up being a defective Ethernet cable that I stepped on or didn't crimp right. Glad you fixed the issue though