What was found
ON TAKEOFF ROLL AT APPROX 90KTS THE AUTOTHROTTLE DISCONNECTED AND WE GOT A TAKEOFF WARNING HORN. TAKEOFF WAS REJECTED AND CHECKLIST COMPLIED WITH, THE AIRCRAFT WAS PROPERLY CONFIGURED FOR TAKEOFF. PERFORMED A/T OPERATIONAL TEST, NO FAULTS. PERFORMED PSEU BITE, FOUND SPD BRAKE DN FAULT 27-62001. PERFORMED FIM 27-62-00 810-808 NO CURRENT FAULTS. ALL TESTS PASSED OK TO CONTINUE. QAR DISK R/R FOR EVAL.