Market SnapshotSingapore stocks opened lower on Monday. STI fell 3%; HPL and HPH Trust rose 2%; Sembcorp rose 0.5%; DBS rose 0.2%; OUE Healthcare fell 4%; NIO and Keppel fell 1%; Singtel fell 0.9%; OCBC fell 0.4%.Stocks in Focus$ST Engineering(S63.SI)$: Its United States subsidiary, VT San Antonio Aerospace, was one of several companies named in a wrongful death lawsuit on Dec 3. Filed in Kentucky, the lawsuit alleged the maintenance, repair and operations unit’s negligence when maintaining the aircraft. It had performed maintenance on the aircraft from Sep 3 to Oct 18. The company will not comment on pending litigation or legal proceedings and will fully cooperate with authorities in the investigation. Shares of ST Engineering closed 1.6 per ce