Does anyone know of a local service who can do mold testing in interior walls? We discovered what we think is a chimney leak that has caused baseboard discoloration and delaminating (from the sheetrock) in the bathroom on the wall opposite the fireplace. Our drywall contractor recommended drilling test holes to examine the interior but I imagine it might be difficult to do a visual inspection without a borescope or outright cutting out a large section of wall. Appreciate any recommendations...