As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PHASE 2 INSPECTION, FOUND HEAD OF BOLT SHEARED CLEAN. THIS IS ONE OF FOUR BOLTS HOLDING BARREL TO BASE OF THE FLAP ACTUATOR. BOLT HEAD WAS HELD CAPTIVE BY SAFETY WIRE IN CONJUNCTION WITH THREE REMAINING BOLTS. DID NOT APPEAR TO BE OVERTORQUED. POSSIBLE BAD BATCH OF BOLTS.