ok, tried to do that, seems to have failed, but list volumes shows retention is 
now correct:

*update
Update choice:
     1: Volume parameters
     2: Pool from resource
     3: Slots from autochanger
     4: Long term statistics
Choose catalog item to update (1-4): 1
Parameters to modify:
     1: Volume Status
     2: Volume Retention Period
     3: Volume Use Duration
     4: Maximum Volume Jobs
     5: Maximum Volume Files
     6: Maximum Volume Bytes
     7: Recycle Flag
     8: Slot
     9: InChanger Flag
    10: Volume Files
    11: Pool
    12: Volume from Pool
    13: All Volumes from Pool
    14: All Volumes from all Pools
    15: Enabled
    16: RecyclePool
    17: Action On Purge
    18: Done
Select parameter to modify (1-18): 14
Error updating Volume records: ERR=sql_update.c:451 Update failed: 
affected_rows=0 for UPDATE Media SET ActionOnPurge=0, 
Recycle=1,VolRetention=63072000,VolUseDuration=0,MaxVolJobs=0,MaxVolFiles=0,MaxVolBytes=53687091200,RecyclePoolId=0
 WHERE PoolId=1
Error updating Volume records: ERR=sql_update.c:451 Update failed: 
affected_rows=0 for UPDATE Media SET ActionOnPurge=0, 
Recycle=1,VolRetention=63072000,VolUseDuration=0,MaxVolJobs=0,MaxVolFiles=0,MaxVolBytes=53687091200,RecyclePoolId=0
 WHERE PoolId=2
Error updating Volume records: ERR=sql_update.c:451 Update failed: 
affected_rows=0 for UPDATE Media SET ActionOnPurge=0, 
Recycle=1,VolRetention=31536000,VolUseDuration=0,MaxVolJobs=0,MaxVolFiles=0,MaxVolBytes=0,RecyclePoolId=0
 WHERE PoolId=3
All Volume defaults updated from "LTO4Tapes" Pool record.
*
*list volumes
...
|       1 | PH0018L4   | Full      |       1 |   816,523,932,672 |      816 |   
63,072,000 |       0 |    0 |         0 | LTO-4     | 2014-12-27 05:54:26 |
...

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