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Like he said, DPP covers even owned and self installed equipment, but the equipment covered must be Echostar/Dish branded or on the approved list of third party parts such as Holland splitters and diplexers just as one example. I had my owned 721's replaced and those boxes still stay as OWNED.
You'll need to watch out for owned receivers being marked as leased though. I have read of people getting their owned receivers marked as leased. It's simple to check though, simply log in to your Dish account and check the Equipment page. If, for some reason, you do not have the ability to check online, or you see an error online, a simple PM to DIRT will get it confirmed and/or corrected.
I'm not sure about this, but I doubt that the techs would even make a big deal about using "unapproved" third-party parts. I wouldn't count on it though. I know that not long after I self-installed my four-Hopper setup (had two leased Hoppers installed by techs,) I needed the dish moved to a different location on the roof because the previous installers placed the dish right under a tree that grew. Dish called me up and said they noticed my signal levels were degrading, and boy were they. I had used a few cables between the switches that weren't the best, so I requested that he give me the cables necessary to replace them while he was there. He had no problem with that.
One thing was for sure, he was quite impressed with my setup. I showed him exactly how it worked, how it was wired up, how all Hoppers could see each other, and even how I had the Joey on WiFi. He had a HUGE grin on his face. I showed him how to set up the Joey on WiFi. He said he wanted to do that for a few installs. I told him that I wouldn't recommend that he do that, as it is an unsupported method and it has a lot of potential for trouble calls. He thanked me for the advice. Not to toot my own horn, but I bet he wished that more people were like me. I think I made his night. It also helped that I was his last call for the night. We hung out for a good 2.5-3 hours. I almost wanted to offer him a beer or a bowl (if you know what I mean.)
When I received the survey call, I gave him all "zeros," which is actually ten on all questions.