Joined: 23 Nov 2006 Posts: 19270 Location: Inside the Matrix
Quickly make an image copy (adrdssu/dfdss) of the pds as it is now - may not be worth anything, but may later be useful.
If the pds and it is not a pdse has had little activity (especially no compress since you made the mistake) and you have a sharp systems programmer, the "good" member may still be "out there". When a member is replaced, the updated member is placed at the "end" of the available space. The original space is still in the dataset and the original data may be recoverable.
It is probably worth a conversation with the system support people to see if one of them can help.
Joined: 28 Nov 2006 Posts: 305 Location: Deerfield IL
If the PDS is backed up and the member you need was in the PDS before the backup and you made the changes today... you may be able to rename the PDS and then issue the command "TSO HRecover PDSname" to recover the PDS from from the backup.