Hello, I'm a mortgage professional.
I don't know the specifics of their loan but there is a way to raise the rate slightly and give them a lender credit that they can use towards closing costs.
Also depending on what the home appraised for there may be a way to raise the sales price and give the buyers a sellers concession.
Like I said I don't know all the details but I can see if I can help with financing and structuring this to work if I had all the details.
You are welcome to get in touch with me if you have any questions or the buyers would like help with this.