As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT DEPARTED AND DURING TAKEOFF, HAD SEVERAL PARAMETER FAILURES. ABORTED THE TAKEOFF. MAINTENANCE NOTICED THE SYSTEM WORKING AND TROUBLESHOT THE SYSTEM BY ANALYZING THE FAULT CODES TO A BUSS FAILURE. SINCE THE SYSTEM WAS WORKING, SHUT DOWN POWER TO RERACK ALL THREE IACS AND NOTICED THE NUMBER 3 IAC KNURL KNOB WAS LOOSE. TIGHTEN THE KNOB AND THE SYSTEM PASSED A FUNCTIONAL TEST. .