georig
Although you can request that only the Mobility component be looked again, the DWP are entitled to review the whole award, it's unlikely that they will take points off of you, but it does happen and I can't offer a guarantee that it won't.
A good place to start would be to consider how likely you are to score the extra points you need for an Enhanced Mobility award.
AS you have an award, it will remain in payment during the MR and any appeal that you might request.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems