I had similar marks on my 1815 Platinum Sax-O-Mat and when I sent it for service via ALS Boutique in Singapore it came back a few months later looking like a brand new watch! No signs of any loss of material due to their laser treatment. Wonderful.
Fast forward to now: it has numerous marks again from daily use. So in short: I would not send it purely for the case but wait till it needs a proper service.
Hope this helps,
Jan