I've only had to get service once (two tools), and that was when my nearest authorized service center was only about five miles away (very short lived, I might add). In that one particular case, I simply called for directions, told them what my problem was, and then dropped off the tools. IIRC, they took down my contact information, tool model and serial numbers, and I gave them my E-box (dashboard) registration ID.
That was it, they verified that my tools were covered under the LSA, serviced the tool and ordered the parts. It took four weeks because of parts backorder but the guy was very nice and he dropped it off at my house.
Now, in all fairness I would not expect any service center to do any delivery (like dropping it off at my house), but at the time this guy was newly enlisted into the Ridgid service (he was a long time service center for various motor and pump companies and from what I understand, was looking for someone to replace another service center which had dropped out). But, any service center should return the tool to you via UPS or whatever.
Unfortunately, my really local guy (Corning, NY area) didn't last very long. I don't know why that is, but now my nearest service center is in Oneonta, NY. Much too far and much too nasty of a road to ever want to visit.... I'll just use UPS, if and when I have to ever seek service again.
I hope this helps,