A knot inside fly line?

Greetings,
I had a Salmon/Steelhead fly line put on by 10wt reel by Orvis on Wednesday
and when I cast it yesterday, I noticed there is a knot under the coating
about 35' in from the tip of the line. I could feel a lump under the
coating when I use my line hand. At first I thought it was just the
coating, but the coating looks fine. I pulled on the line a bit to try to
stretch it out, but no luck. Would this be a defected line? It bothers me
in a sense that it's right where my line hand touches.
Advice? take it back to Orvis?
-tom