It depends on your model... on our 36RL, it is located above the bedroom TV on the top/right side. Do a search of this forum to find the other places for the amp on different models.
In our '13 rl with tall cabinet with shelves next to closet, it's in the cabinet to the left of the tv, upper right of "wall" abutting the tv -- just a small button, maybe 1/8" in diameter and sticks out 1/8"from "wall" --- very tiny!!!
Thanks everyone! It WAS in the bedroom, in the cabinet to the left side of the TV. Thank you so much, you made our very first trip in our new Redwood SO much better. Certainly glad we found the forum! One of these days, maybe I will have learned enough to help someone else. Have a great weekend everyone.