Located to the best of our abilities where the P-trap would be from under the tub in the garage. Cut open about a 3‘ x 3‘ hole in the wet drywall and removed it with wet insulation. Now that the repair is done we do recommend leaving it open for a week or two just to confirm that it does not leak again. What we found was water leaking out of the overflow gasket. Each set screw went in about a full inch sucking gasket tighter to the fiberglass which created the watertight seal also removed a Barbie mermaid tale from the drain and now the drain runs better. CPI is not responsible for drywall replacement or repair. Thank you for choosing CPI.