Ignoring the double negatives--Zak,
If a can fails can it not be destroyed and a new one made with the same serial number?
NO. Not permitted per ATF rules.
There is ONE scenario where this is listed as allowed in the NFA handbook, and that is when quote, "Unless the outer tube is replaced by the manufacturer prior to its removal from the manufacturing premises for purposes of sale or distribution (see Q6), the replacement of the outer tube amounts to the making of a new silencer." [page 176 of the PDF version of the NFA handbook]
ETA--Nice work LeftyJason !!!