I had an Air conditioner leak above the garage. My plumber called Drylux, he was there in 10 minutes with a bid. He looked at it said, mold, damage, replace dry wall, replace 2x4's $2600.00
I called another company- he looks at it, and says, we just need to dry it out, drill a couple of holes to allow air in attic and patch $200-$250. "unless ceiling is sagging from wetness, no need to replace it."
So I told him about Drylux and he said, they give the plumber $800 off the top if you go with them.
BEWARE