An unattributed report in a Detroit newspaper Wednesday said that the Detroit Tigers turned down a Pedro Guerrero-for-Frank Tanana trade before the Dodgers traded Guerrero to the St. Louis Cardinals for John Tudor. Tony Attanasio, agent for Guerrero, had said Tuesday that he had heard that Fred Claire, the Dodgers' executive vice president, had talked about trading Guerrero for a left-handed pitcher with Detroit and Toronto . . . The Dodgers demoted relief pitcher Ken Howell, who had been activated on Monday, but had not pitched and will promote a position player today. . . . The St. Louis Post-Dispatch, in a page one story Wednesday, said that the majority of fans who flooded the newspaper's switchboard with calls in the wake of the Tudor trade felt that the Dodgers got the better of the deal. Complained one caller of Guerrero: "All they (the Cardinals) are going to do is acquire another lame-bird player with a history of injuries." . . . Jeff Hamilton, on the disabled list with a separated cartilage in one of his ribs, took live batting practice for the first time since his injury in late July. Trainer Bill Buhler said that Hamilton felt no pain while swinging a bat, but that it is unrealistic to immediately activate him. "When you're off that long, I don't think you can come back in against live pitching. You need some time to see pitching." Hamilton still feels discomfort fielding ground balls. . . . Pitcher Mario Soto, rehabilitating from shoulder surgery in 1986, is expected to pitch another simulated game on Friday. It will be Soto's fourth simulated game. . . . Mike Marshall returned to the lineup after missing a game with flu symptoms. Marshall on Guerrero's departure: "You'd love to have Pete in the lineup, but we played a long time without Pete. Hopefully, we'll have enough offense to win. I think another established starter will help our chances."