Boeing now finds a defect with 737s. What is it?
In an official statement, Boeing said that it had relayed the defective lot number to aircraft owners so they can inspect the parts in question

New Delhi: Boeing has discovered a defective wing part on some of its medium-haul 737s, including the 737 MAX 8, which could impact the takeoff and landing of the aircraft. However, no reports have emerged so far of flight issues linked arising due to the defect. In an official statement, Boeing said that it had relayed the defective lot number to aircraft owners so they can inspect the parts in question.
“If operators find the defective parts on their aircraft, they should replace them before putting the plane back in service,” it said. The problems have been detected with a batch of a part involved in deploying the wings’ leading edge.