What was found
DURING T/O ROLL AT APPROX 65 KIAS (ON CAPT'S A/S IND) THE MACH A/S WARN CLACKER SOUNDED. REJECTED T/O AND COMPLIED WITH RTO CHECKLIST IN QRH. RETURNED TO GATE. PERFORMED MACH AIRSPEED WARN CHECKS IAW 727-200 M/M 34-14-002-5, BOTH NR 1 AND NR 2 OVERSPEED WARNING SYS CKD WITHIN M/M LIMITS AND PITOT/STATIC SYS. LEAK CKD GOOD. CKD BOTH SYSTEMS AT REQUIRED ALTITUDES AND AT SEA LEVEL AND FIELD ELEVATION AT KMEM, NO ABNORMALITIES NOTED WITH EITHER SYSTEM. UNABLE TO DUPLICATE DISCREPANCY. A/C IS OK FOR SERVICE.