As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE IS UNDERGOING MAINTENANCE. DURING THE REMOVAL OF THE BREATHER ROTOR ASSEMBLY, 4EA BOLT & NUTS WERE FOUND INSTALLED INCORRECTLY. SUBSEQUENCE VISUAL INSPECTION FOUND THE GEARSHAFT (PART NUMBER: FK18214 SERIAL NUMBER: EE223107-U) WAS SCRATCHED AROUND AND THE BOLT WERE DAMAGED. SINCE THERE IS NO ACCEPTANCE CRITERIA ON THIS DEFECT IN THE CURRENT ENGINE MANUAL, THE GEARSHAFT IS REJECTED AND WILL BE REPLACED WITH NEW.