[ReelMagic]

I own a 2003 38 Open and have experienced similar problems over the years and determined it was the diaphragms in the horns themselves. My horns are FIAMM air horns, also known as Fultone Series Twin, model 6235112. There is a repair kit that includes new diaphragms, kit 2132311.... The root problem is the diaphragms stretch over time and the seat which the diaphragms seat on get salt on them causing the horns to sounds the way you describe.. Clean horn seats and replace diaphragms .. M2C