As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 7001 - TRAINING FLIGHT. CREW REPORTED A SLIGHT PROPELLER VIBRATION WHEN PROPELLER CONTROLS WERE SET AT 80 PERCENT NP. CREW ELECTED TO RETURN TO FIELD. AIRCRAFT LANDED AT COS WITHOUT FURTHER INCIDENT. MAX - MX REPLACED LT PROPELLER ASSEMBLY IAW AMM 61-10-00. GROUND CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (X)