LOS ANGELES — The sounds of the trumpets synonymous with Edwin Díaz are meant to signal that one of baseball’s best closers is entering the game.Lately, however, they’ve felt more like an SOS call.With their already short seven-man bullpen even thinner Friday night, Dodgers manager Dave Roberts was left with little choice but to turn to his struggling closer to protect a two-run lead in the ninth. In normal circumstances, no one would have blinked an eye. This is precisely the situation the Dodgers had in mind when they dished out $69 million over the winter to bring Díaz to Los Angeles, shoring up a rare roster need.But after blowing three saves in the last week — including one Thursday night that resulted in him being booed on the field — and seeing his ERA balloon to double digits, there is little trust in seeing Díaz jog to the mound in any leverage situation. Still, Dodgers fans watched the top of the ninth with bated breath, hoping he could close out a pivotal victory over the National League-leading Milwaukee Brewers.Three baserunners, two walks and one hit batter later, Díaz did indeed lock down the 3-1 win. Nothing about it felt comfortable.“It wasn’t pretty. I watched the inning too,” Roberts said postgame. “But he found a way to make a pitch when he needed to.”