Asia’s export boom is showing signs of slipping into a deeper than expected downturn, HSBC Holdings Plc. and Nomura Holdings Inc. both warned in research notes published Tuesday. The warnings from both lenders suggests the trade surge that powered Asia through the pandemic is at a turning point, matching signals that manufacturers have been sending through the year. In a note titled: “Plop’ - What the latest electronics indicators signal for Asia,’ Frederic Neumann, chief Asia economist at HSBC warned that key indicators are showing a slump in new orders with demand for Asia made electronics clearly coming off the boil. “Things are coming back down to earth - fast,” Neumann wrote. “True, the headline electronics PMIs, freshly released for July, don’t look quite so alarming at the surface. But dig deeper, and the stumble becomes apparent.”