Well seeing as its now in the public domain!
Wobble2plank has it on the money!
It was not a reverser unlock! and on the subsequent landing it all did 'what it says on the tin'!
Engines 2 and 3 REV Amber (cowl position) within approx 15 secs of each other during the roll. As the aircraft was still on the ground this resulted in a command to the FCU's to retract the L/E flaps Group A. The reverser commands to the FCU's operate in pairs 1&4 2&3
The L/E flaps probably extended again as the a/c became airborne.
