Alternative Solution:

1. Detach the PE database and attach a recent backup. Any changes since that backup was made will be lost, so only do this if you do not mind losing data added to the database since the last backup. This is a good option if you merged records early in the morning after a scheduled backup before making sales for the day.

OR

2. Attach a backup containing the unmerged records to the server as a separate database. This could also be done on a standalone workstation. You can then copy down the information from the records pre-merge and try to recreate them in your live database.