Engines started for the first flight in a while...
Boeing #272 Flight Tracker
It's LN86, a LOT example.
Boeing is on the verge of flight testing the modified 787 battery system changes on Line Number 86, an aircraft destined for LOT Polish Airlines. The aircraft is set to undergo a final pre-flight ground test in the afternoon (Pacific time), at Paine Field, Everett on 24th, and if all goes to plan could be cleared for a standard ‘B2’ profile, customer acceptance type flight test on March 25.
Boeing sets up for 787 battery flight test