Every situation is diffrerent. Freddie Mac is usually not in the business of putting more money into properties. But a new well will mean that they will not be able to sell the home FHA as the home will likely not meet their standards. With that reduction of buyer pool it could affect their price.
If they don't have multiple offers on the property when you submitted and/or a lot of interest, it is possible. If they had people beating down the doors, probably not likely. Also depends on the price you got for it.
The only way to know is to ask. I have seen them do it before. They will get their approved contractors to give them estimates and then look at their bottom line. However, depending on the asset manager, Freddie Mac will take time. A decision like this could take them 2-4 weeks to decide and there is no way to know. Keep that in mind and make sure your attorney structures the inspection letter as such to allow you to get out of the deal if they don't. Or you can renegotiate the price if your financing will approve the house. Good luck.