SHEBOYGAN, WI (WHBL) - Fire in a mattress caused an estimated $40,000 damage to a home in the 1000 block of Kentucky Avenue Thursday afternoon. The Sheboygan Fire Department said the fire was discovered around 12:30. Shift Commander Gary Kohlberg said firefighters arrived on the scene to find a mattress in flames in a second floor living room. He said the flames were beginning to spread to the walls and into the attic and firefighters remained on the scene for several hours to get at smoldering areas in the walls and ceiling. No one was injured and the cause remains under investigation.