Now, are you sure that it is just the label which is blown?  If you are
having trouble reading the tape, it may be more than just the label.
I would first physically examine the tape, and then exercise it with
'tapeutil' to begin with, to see what can be read from it.  Generally,
get a sense of what is wrong before getting extreme and possibily
depending upon a copy of something corrupted.
You may have to consider giving up on the physical tape and do a data
recovery from a backup storage pool.         Richard Sims, BU