As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, PILOT IN RIGHT SEAT NOTICED AN UNUSUAL TICKING NOISE. DURING INVESTIGATION, DETERMINED THAT IS WAS CAUSED BY A BOLT IN THE NOSE CASE OF THE RIGHT ENGINE BACKING OUT AND CONTACTING THE AFT FLANGE OF THE PROPELLER. CREW SECURED THE ENGINE AND RETURNED TO THE DEPARTURE AIRPORT. MAINTENANCE DETERMINED THAT A TOTAL OF 3 OF THE 10 BOLTS THAT SECURE THE NOSE CASE TO THE ENGINE HAD SHEARED AND WERE LOOSE.