Not a probe. Just a lump of fibreglass/aluminium.
It's on the thrust reverser translating cowl. It is a ramp that pushes back a spring loaded section of leading edge flap for clearance when the T/R operates.
Try this picture
https://i1.ytimg.com/vi/d-wvNXU-PmA/hqdefault.jpg
Last edited by Big M; 3rd May 2015 at 14:29.