On what page does Mildred report Montag to the red report booth in Fahrenheit 451?

There is no page that mentions Mildred going to a red report booth in Bradbury's Fahrenheit 451. In the book, Montag returns to work after taking some time off to read and decide if he wants to continue to be a fireman. When he returns, the first call that his firehouse is sent on is to his own home. Captain Beatty puts Montag to work burning down his own home after he sees his wife walking out of the house, getting in the car and leaving. She doesn't even say a word to her husband. She only says something about her TV program: "Poor family, poor family, oh everything gone, everything, everything gone now. . ." (114). It's only after Montag is forced to burn down his house that he turns to Captain Beatty and asks, "Was it my wife turned in the alarm?" (117). Beatty nods, but also tells him that her friends had reported him earlier, and that he had been waiting for the right moment to force Montag to burn down his own house.