SDR 510018824 Eurocopter AS350BA Main rotor mast/swashplate bearing unserviceable. Main rotor swashplate bearing cage phenolic material had multiple hairline cracks, causing cage to separate at rollers. Rollers then contacted each other, overheated and pushed seal out of bearing allowing grease loss. P/No: 704A33651158. TSN: 301 hours/11 months.