As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING WALKAROUND PILOTS NOTICED GRINDING NOISE COMING FROM LT ENGINE. MAINTENANCE WAS CALLED TO INVESTIGATE. GRINDING NOISE WAS COMING FROM POWER SECTION AREA. OIL FILTER WAS CHECKED AND FOUND TO BE CONTAMINATED WITH METAL CHIPS. ENGINE WAS REMOVED AND SENT TO OVERHAUL SHOP FOR TEAR DOWN AND REPAIR.