With 31 Days of Oscar finally ending on Tuesday, TCM on Wednesday will begin a retrospective salute to the perenially underrated (as an actor) Ronald Reagan. For some reason, TCM is drawing almost exclusively on his pre-1948 work for Warner Bros. — there’s no “Storm Warning,” “The Winning Team,” “She’s Making Her Way Through College,” “Bedtime for Bonzo,” “Cattle Queen of Montana” or “The Killers,” though we do we get his two MGM films, “The Bad Man” with Wallace Beery and “Hellcats of the Navy,” his only flick with Nancy Reagan, from Columbia and the director of “The Attack of the 50 Foot Woman,” Nathan Juran. And of course his two signature roles in “King’s Row” and “Knute Rockne, All America.” The first night’s offerings are a marathon of the Gipper’s lively low-budget efforts at Bryan Foy’s B-unit at Warners, leading off his with his four flicks as dashing Secret Service Agent Brass Bancroft, including the little seen “Murder in the Air” with the lovely Lila Lys. Here’s my overview from today’s print edition of The Post, as well as a list of highlights.