What was found
SHORTLY AFTER APPROACHING 80KTS ON THE RUNWAY IN KLAS, THE FIRST OFFICERS WINDOW POPPED OPEN AND THE CAPTAIN ABORTED THE TAKEOFF (ATO). CREW RESECURED THE FIRST OFFICER'S WINDOW AND LINED BACK UP FOR TAKEOFF. A/C DID NOT RETURN TO THE GATE AND MAINTENANCE WAS NOT CONTACTED. A/C CONTINUED FLIGHT WITHOUT INCIDENT. A FOLLOW UP HAS BEEN CREATED TO CHECK FOR PROPER LOCKING OPERATION AND OPEN/CLOSED INDICATION OF THE R2 WINDOW.