The Lehman Trilogy” plans to return to Broadway this fall, a source told The Post.Playwright Stefano Massini’s drama (adapted by Ben Power), which won the Tony Award for Best Play in 2022, would begin performances at Lincoln Center’s Vivian Beaumont Theater in September.The three-hander — a sprawling history of Lehman Brothers leading up to the 2008 financial crash — would slide in to fill the void left by the revival of Lerner and Loewe’s “Camelot,” which opened in the spring and is closing early on July 23 due to poor ticket sales. That 1960 musical, directed by Bartlett Sher, had been extended through at least Sept. 3, but it did not garner the same level of acclaim or demand that his revivals of Rodgers and Hammerstein’s “South Pacific” and “The King and I” did.