TSM 4.1.4 running on AIX 4.3.3

Hi,

Attached to this server is a StorageTek L700 tape
library, after running flawlessly for over a year. I
have begun seeing problem tapes popping up here and
there.  There is this one tape of which I could not
mount it for anything, the TSM just gave it up by
saying "Mount Request denied", but 'q vol' showed
nothing was wrong with this tape.

Have any ones encountered problem like this, and any
suggestions to fix it, other than phsically removing
it from within the tape library?

Thank you.

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