As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE TOWER REPORTED SPARKS COMING FROM THE NR 1 ENGINE AT START OF TAKEOFF ROLL. THE TAKEOFF WAS REJECTED AT LESS THAN 60 KNOTS. EQUIPMENT WAS DISPATCHED AND THERE NO VISIBLE SIGNS OF FIRE OR SMOKE. THE NR 1 ENGINE WAS REMOVED AND REPLACED. ENGINE OPERATION AND LEAK CHECK WAS GOOD. SHOP FINDINGS REVEALED THE PRIMARY CAUSE OF ENGINE FAILURE WAS DUE TO THE FAILURE OF A C-7 BLADE.