As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TWO SEPARATE OCCASIONS THAT DURING THE TAKEOFF ROLL THAT THE ACM OVERHEAT ANNUNCIATOR ILLUMINATED. ABORTED TAKEOFF ON BOTH OCCASIONS. THE CREW COMPLETED TROUBLESHOOTING ACTIONS & COULD NOT DUPLICATE THE FAULT. THE SUBSEQUENT TAKEOFFS WERE NORMAL. TROUBLE SHOT THE SYS & FOUND THE LT CONTROL VLV PN 9912492-1 TO BE DEFECTIVE. THE VLV WAS REMOVED FROM SERVICE & REPLACED WITH AN OVERHAULED UNIT. OPERATIONS CHECKED OK.