2019-SW-076-AD, Leonardo S.p.A. Model A119 and AW119 MKII helicopters, to Require Inspecting for Movement and the Tightening Torque of the Tail Rotor (T/R) Plug, the Installation of the Outboard and Inboard Faces of the T/R Duplex Bearing, and the Condition of the T/R Plug Threads, Nut Threads, and T/R Duplex Bearing. 2019-SW-076-AD