Yes, it means open the back cover, yes, all the screws, yes, every switch, even if new.
I bought 13 from different dealers and all 13 were miswired. That's 100% failure rate.
Again, multi step fix:
#1 correct and inspect terminal wiring order
#2 solder critical folded tab electrical connections- the back cover is off anyway.
#3 before installing the metal cover back, ensure it cannot short to the poking up solder joints and wires of the terminals- even better add preventative insulation to prevent any short rather than depending on an air gap.
It's your time your effort, and a soldering iron and some insulating tape, but doing it up front, before installing the switch, or do it later, when the problems kick in, now it's buried and has scenery around it on a hard to reach area of the layout.