As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO FIELD DUE TO MULTIPLE CB'S TRIPPED PRIOR TO ROTATION, MULTIPLE EICAS MSG'S. LEFT GENERATOR CONTACTOR, C901, PHASE -B- TERMINAL LUG WAS FOUND CRACKED / BROKEN, PROMOTING ELECTRICAL PROBLEMS AND CAUSING SOME CIRCUIT BREAKERS TO POP. THE TERMINAL LUG WAS REPLACED, THE AFFECTED C/BS WERE RESET AND CORRESPONDING SYSTEM OPS CHECKS WERE DONE AND AIRCRAFT RETURNED TO SERVICE.