Hi. I will be arriving on Monday July 26 in the morning to go to Bures-sur-Yvette from CDG. According to Google maps the RERB route requires a bus (BUSRERB) at Croix de Berny to Gare de Massy Palaiseau Vilmorin. Is that correct? A year ago I just took the RERB directly from CDG to Bures-sur-Yvette. Are there no more direct trains?