House I rehabbed under contract but buyer wants waterproofing guarantee

[Jonathan C.]

Rehabbed a house, under contract with a buyer to sell it post-rehab, home inspection just came in and found some evidence of some mold in the house, which I suspect was caused by humidity or maybe was there when I bought it and we missed it somehow. I have no reason to think the waterproofing is not doing the job.

Problem is, although the house was waterproofed correctly- trench dug around whole base of house, french drain, waterproofing stuff on walls, sump pump- it was done by the GC, not by a 'waterproofing company' that provides a guarantee on the work. The GC is not willing to provide any sort of guarantee. I'm worried the buyer is going to get spooked and not go forward... any ideas on what I can do at this point?

Thanks