As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT HAD LOUD NOISE THEM VIBRATION, WAS ON TAKE-OFF OUT OF 15K FEET AT 285 KNOTS. RETURNED TO KRDU AND FOUND RIGHT ENGINE LOWER COWLING MISSING AND TOP COWLING HANGING ON AT TOP INBOARD ATTACH. FASTENERS WERE IN INLET AND TR AND COWLING SHEET METAL WAS TORN OUT AT ALL HOLES.