It looks as if two of the three pilots had been napping up until about 0200, and the alert pilot, the captain, leaves the cockpit.
From both the English and French versions.
A 1 h 55 min 57, le commandant de bord réveille le second copilote et annonce « […] il va prendre ma place ».
A 1 h 55, the Captain woke the second copilot and announced "[…] he’s going to take my place".
It would seem there was no playing with the radar with respect to tilt or gain, and they flew on expecting little more than some light to moderate chop.
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Is the second co-pilot the junior co-pilot, and is he the PF?
Both versions omit what appears to be a name reference in the captain's announcement.