I have never needed to use their customer service, but...
About 10 years ago I bought a used 1.5 x 5 vx 3 scope to mount on my 45-70. I thought it would be wise to have it checked over before mounting..so called Leupold up and inquired about how much for such a service, saying right up front I got it used.
I was told to send it right out, they would go through it and return it to factory new specs, and return it free of charge within the week.
Wow!
NIce to know, but I ended up getting in a hurry and mounted it....still haven't had any problems with it. of course. Ya pay for what you get.