Hook for Bernina Activa 130

Question

I got my Bernina serviced in the fall and he adjusted the hook, timing and polished hook so I could sew with machine but he told me he wasn't sure how long it would last and may need to order a part- May need a hook?Wondering what part I may need to order and can I do this or will the Serivce man that fixes the sewing machines at the store have to do this.Thanks