As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON RELEASING BRAKES FOR TAKEOFF AT SJC, (4) LOUD KNOCKS IN RAPID SUCCESSION WERE HEARD FROM REAR OF AIRCRAFT. ABORTED TAKEOFF AND RETURNEDTO RAMP. INSPECTED BRAKES & ENGINES & FOUND NO DEFECTS. TAXI CHECK & PERFORMED ENGINE RUN UP TO TAKE OFF POWER SEVERAL TIMES WICH NO DEFECTS NOTED. COULD NOT DUPLICATE DISCREPANCY. WORK DONE IAW CE-560XL MM CH 32-42-00 & 71-00-00.