Ratling noice at 80mph

Just driven 2000miles in two weeks with my 348 and it worked very well. Only problem what I found was ratling noice at almost exatly at 80mph and this was only when I was slowing down from higher speeds, not when accelerating from lower speed to higher. It seems to come from drivers (left hand) side and is like resonance sound and quite loud. My first quess is that it's from wheel bearing but have somebody had similar problem and what caused that noice? No problems on other speeds. Just preparing myself to spend some $$ to fix it