Help! Sagging Lintels Above Garage Door

[Max James]

I am currently under contract on this four family for a fantastic price.  The only negative aspect of the entire building is with these sagging lintels on a load bearing wall at the rear of the building.  This is not the greatest picture, but should give you an idea of what is going on.  

Has anyone ever had this happen to one of their homes or ever bought a home with this type of issue?  What was your solution?

Any input would be much appreciated.  Thanks.