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The airline said it had found "instances" of issues that appeared to relate to the installation of the door plug, including "bolts that needed additional tightening".
United Airlines has found loose bolts in several 737 Max 9 aircraft in its fleet, days after a panel fell off one of the jets mid-flight.
Aircraft model has been grounded after a panel blew off an Alaska Airlines-operated plane mid-flight on Saturday
Plane manufacturer Boeing earlier Monday said it sent instructions to airlines to conduct the inspections of the Max 9s in their fleets.
The panel in the jet fuselage detached after takeoff on a flight from Portland to Southern California's Ontario International Airport. Here's what to know about...