Dead DTA -- The quickest fix?

We're a longtime Comcast Business customer (Internet and Business TV). One of our DTAs has died--No power on, no lifesigns of any kind. We need an expedient replacement. I don't have time to spend hours on the phone answering entry-level questions read by clueless calltakers (I've been a broadcast engineer for 45 years. I know a dead box when I see one). The last time we had a problem I went to the nearest service center and was told they couldn't help me because I'm a business customer.

That leaves my options somewhat limited. I'm shorthanded and can't afford to waste a lot of time chasing this around. It's time I simply don't have.

I'd be happy with a replacement DTA shipped or delivered to our office with a return label for the old one. I could even leave the old one at the front desk in advance (it's not doing anything anyway).

Any suggestions for the shortest route from dead DTA to living TV?

Thanks!

D.