Governor Arne Carlson is calling lawmakers back to the Capitol on Monday morning for a special legislative session to help out the Marvin Windows & Doors company. Most legislators want to help Marvin... but that does NOT necessarily mean the session will go smoothly. Minnesota Public Radio's Martin Kaste reports: Legislators generally agree that it's a good idea to help Marvin Windows with a small change in the wording of state law. That change would make it easier for Marvin to sue one of its suppliers for fraud... Marvin says it bought a defective wood sealant from PPG Industries of Pennsylvania, and four-years-worth of wooden window and door frames are now rotting away as a result. Marvin's lawyers say if the company isn't allowed to sue PPG for fraud, it might not be able to handle the cost of