When installing service pack 1 or 2 for Esri Production Mapping 10, the Program Compatibility Assistant dialog box appears. The dialog box indicates that the ReviewerServiceUninstaller program may not have installed correctly. If the Cancel button is clicked, the service pack is prevented from installing. As a result, the Data Reviewer and Production Mapping extensions will not appear on the Extensions dialog.
This is a known issue. Reference bug number NIM069614 for updates on its status.