What was found
(CAN) DURING TAKEOFF ROLL AT APPROXIMATELY 75 KTS, AN, ADC 1 MISCOMPARE AND STALL PROTECT FAIL, CAUTION MESSAGE POSTED. COPILOT PFD INDICATED 30 KTS. ADC 3 SELECTED ON CO-PILOT SIDE WHICH ALSO INDICATED 30 KTS. A REJECTED TAKEOFF WAS CARRIED OUT AND ACFT TAXIED BACK TO RAMP. UPON RETURN, TROUBLESHOOTING DISCOVERED THAT LINE P1 AND STAIC LINE S2 WERE CROSSED CAUSING A MAJOR LEAK IN THE SYS THUS FAULTING THE INDICATION. UPON TROUBLESHOOTING, THE LINES WERE REINSTALLED PROPERLY AND A FULL 24 MONTH TEST WAS PERFORMED IAW AMM TO PROVE THE SYSTEM. ACFT WAS DISPATCHED FOR FLIGHT WITHOUT FURTHER INCIDENT.