Im having strange 219 errors.

Netbackup 4.5 on Solaris 8 connected to a d180( i think ) 8 tape stacker.

Storage unit has all of a sudden become unavailable, but using rob test 
i can get to it and move tapes around fine.

When i launch a manual job it just errors with 219 not available. 
Nothing has changed in my policy settings so im at a bit of a loss as 
things were working fine.

Cant see anything mentioned in bptm logs :(

Anyone any idea to point to?

Cheers