19Jan2022: Wai Chung informed that they want PM of the GCMS (Model: 6890N, SN: 5973) and Frontier Multi-shot Pyrolyzer (Model: PY-3030D, SN: PY1522320291D) ONCE IN EVERY 2 YRS i/o annually. NOTE: Last PM was on 18 Jan 2021 & therefore will skip Yr 2022 PM to next year due 18 Jan 2023. To follow up with him in Dec 2022.