Boeing 737 MAX 9 jets remain grounded after a refrigerator-sized fuselage door plug blew off an Alaska Airlines plane near Portland, Oregon, on Friday. Officials with Alaska Airlines and United Airlines say they have found loose bolts and other problems on some of the grounded jets. Meanwhile, the online news outlet The Lever is reporting employees at a Boeing subcontractor were told to falsify records after inspection teams found an “excessive amount of defects” in parts being made for Boeing. Spirit AeroSystems reportedly manufactured the door that blew out on the Alaska Airlines flight. The Lever reports a group of Spirit shareholders filed a federal complaint last year saying Spirit executives had “prioritized production numbers and short-term financial outcomes over product quality.” Spirit was established nearly two decades ago as a spinoff of Boeing.