Engine 86-1, Tanker 86 and Rescue 86 all responded to a reported smoke condition inside a house in Lower Salford Township.  Chief 89 assumed 89 command and advised Engine 86-1 to standby the hydrant until the source was found.  Crews located fire in a back wall and assisted in extinguishment and overhhaul in the area of the fire.  Crews remained on scene until released by 89 command.