What was found
ON TAKEOFF ROLL, AFTER PRESSING THRUST TILE, THRUST LEVERS BEGAN TO ADVANCE, THEN A/T DISC AMBER LIGHT ILLUMINATED & THEN RED STABILIZER EICAS ALERT APPEARED. REJECTED TAKEOFF AT 30 KTS. PERFORMED TROUBLESHOOTING IAW FIM 31-51 FAULT TREE 818. BLOCK 01, 11 & 21. FOUND NO CONTINUITY BETWEEN PIN 22 & 23. R & R CTR LST MM 521 IAW AMM 27-48-01-4. OPERATIONS CHECKED OK.