As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: HANDLE AT 2L AFT ENTRY DOOR POPPED UP ON THE TAKEOFF ROLL, CAUSING MASTER CAUTION AND LOW SPEED 30 KNOT REJECT. HANDLE DOWN WAS PLACED DOWN AND IT POPPED AGAIN AFTER LIFT OFF. MAINTENANCE ACCOMPLISHED DOOR SYSTEM TEST PER AMM 52-13-00-700-805 AND FOUND HORIZONTAL CONTROL ROD OUT OF ADJUSTMENT. MAINTENANCE ADJUSTED HORIZONTAL CONTROL ROD PER AMM 52-13-00-820-801.