How To Get Sellers To Pay for Repairs found during Inspection

[Steven May]

I am in the process of purchasing my first home. The sellers have agreed to pay a majority of the closing costs and to fix some vinyl siding that needed to be repaired.

After having the inspection done, a mold spot was found in the ceiling in the garage - there is a bathroom located above it. The inspector believes it may be a leak from the bathroom. He is returning tmrw to do a more specific inspection of the area.

If there is an additional repair costs for a leak or if there needs to be mold removed - how do I get the sellers to pay for the costs? The house is under contract and closing is in two weeks.