As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING SCHEDULED INSPECTION PITTING CORROSION IN EXCESS OF .005 INCH HAS BEEN DISCOVERED. THE PATTERN AND LOCATION OF CORROSION PITTING CONFORMS TO PROCESS STAMP IMPRESSION (186). IT IS LIKELY THAT IMPROPER INK HAS BEEN USED DURING SHAFT OVERHAUL. OVERHAUL SHOP(S) HAVE BEEN ADVISED. THE ORIGIN OF THE STAMP IMPRESSION IS YET TO BE ESTABLISHED.