As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAKE OFF ROLL, ENGINES WERE SPOOLED TO 1.4 EPR BRAKES WERE RELEASED AND EPR POWER WAS ABOUT 1.8 WHEN A DIFINITE LOUD VIBRATION WAS HEARD AND FELT. NR 2 N2, N1, AND EPR JUMPED ABRUPTLY AND AUTO PACK TRIP OCCURED. TAKE OFF ABORTED AND RETURNED TO GATE SPEED = 90KTS ALL INDICATIONS ARE NORMAL AT IDLE