Mares doesn't reimburse dive shops for labor fees. Just parts.
It would be wrong to expect a local dive shop to have to absorb the time and costs of servicing a regulator that the online retailer obviously did not properly bench test in the first place. Abitton purchased his reg online to save a few bucks (there's nothing wrong with that). And, the online retailer just shipped a regulator in stock without testing it to save a few bucks. Why should the LDS that gained absolutely nothing in this transaction get stuck picking up the bill?
The right thing to do in this case would be to contact the online retailer, and have them repair or replace the regulator. It will be an inconvenience, and it will take a little extra time, but these are the types benefits that you give up when purchasing online.
Abitton,
You ask if you should have to pay for labor on a reg that you purchased a month ago. I'm not sure...probably not. But, I hope you realize that someone has to. I think the online retailer should do the right thing and take care of you (not the LDS).