Hi Folks, The Continental TSIO-360-LB-1B engine in my Mooney M20K-231 was rebuilt 2 years ago. At my last (current) annual, the A&P found 3 broken cotter pins in the oil screen, and followed up with a Boroscope camera to identify that at least one of the pins did indeed come off of the castle nut that secures the connecting rod. The shop that performed the rebuild (Daytona Aircraft Services) has offered to make any repairs necessary at their cost, even though the warranty on the engine