As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAKEOFF ABORTED FOR LOSS OF POWER/ROUGH RUNNING ENGINE. POST-FLIGHT MAINTENANCE INSPECTION REVEALED 3 INCH HAIR LINE CRACK RUNNING CIRCUMFERENTIALLY, BETWEEN NR 14 AND NR 15 FIN (COUNTING DOWN FROM TOP) OF NR 2 CYLINDER. SMALL BURN AREA OBSERVED ON NR 4 CYLINDER INTAKE PUSH ROD TUBE. REPLACED ENGINE.