I understand. I still believe it would be possible to make a backup of the current Management Reporter database, restore a backup of that same database before the problem occurred, open the row definition for the affected report, copy that into Excel, restore the current backup, open the bad row definition and paste the Excel rows back into the current row definition over the bad definitions. It depends on how many rows are involved and whether this effort would save time over just redefining the rows.
If you are brave and comfortable with SQL you could also restore the older Management Report database to an alternate database name and create an update query to update various rows in the active database table with data from the alternate database. Again, it is a questions as to which gets the issue resolved quicker.