What was found
DURING THE TAKEOFF ROLL, THE FLT WAS ALERTED BY A ELPMP AUTO FAIL CAS MESSAGE. THE FLT CREW ABORTED THE TAKEOFF AND RETURNED TO THE GATE. DENVER MX INSPECTED THE A/C AND CONDUCTED GROUND RUNS IAW AMM JIC. 28-00-00. ALL CHECKS WERE SATISFACTORY. MX UNABLE TO DUPLICATE THE PROBLEM. A/C RETURNED TO SERVICE. A/C EXPERIENCED THE IDENTICAL AS THE DAY PRIOR, ELPMP AUTO FAIL. COS, MX REPLACED BOTH THE JET AND ELECTRIC BOOST PUMPS. GROUND CHECKS WERE SATISFACTORY. A/C RETURNED TO SERVICE.