Thanks all. "Drain king" seems to be a good start. I'm a "snake" guy myself but these lines look like corrugated flex PVC and I'm afraid I'd cut right through them...and yes they are 1 1/2 inch lines.

There is course white granite stone around the deck. My guess is that the previous owner vacuumed some up cleaning and one or more got stuck. I'm afraid this isn't going to be as easy as solve as I was hoping.