Sold my Tablo, new owner has an issue with sub

This is an interesting problem. This would never have occurred to me. For your part, things are close-ended, it’s completely in the hands of Tablo (support, etc.), but … if you submit a trouble ticket on this, supply Serial number, etc. it might help things, inasmuch as they’ll be getting this from both ends. At a minimum, it will strengthen the validity of HIS request. Just a thought.