Assuming that you have these freqs in a favorites list, you can edit the info through the Sentinel software. Click on the Edit Favorites icon; select the particular favorites list which has the freqs you need to edit; click on the item in the left hand column which will contain the freqs for editing; observe the column labeled "Modulation," and click on it; this should bring a drop-down menu with the mods; select AM. Viola! Remember to select save under the file menu before leaving the edit screen.
This might make the build that should be running right now. Started at 17:00 hours central time. We pull Nationwide first, then alphabetically by state. If so, it will be corrected in HPDB this morning around 9 am. Otherwise, next Monday.