I got a good deal on a slightly used La Marzocco Gs/3. I'm anticipating receipt in a week. Before install, I think it would be a good idea to descale? A call to Franke (La Marzocco) tech service did not yield an answer that wasn't what I was hoping - they instructed to remove the boiler or call a service.

Searches have yielded only HX machine info. I've never had a double boiler machine and don't want to mess up this beauty, can anyone help or direct me please?
thank you!

Try here

Edit: Preventive Maintenance and Cleaning (GS/3 Users Manual V 1.00, page 11) explains the draining procedure. You will want to check here: GS/3 Cafe.