Do a search on heater core replacement. I recently posted a step by step post on replacing a heater core in a 2001 Horizon. It's really not too big of a deal, just a little overwhelming thinking about removing the whole front of your motorhome! You can probably do it yourself in under six hours. The hardest part for me was getting the new one in the existing case without removing the nipples. I think if I do it again, I will probably remove the nipples.
Also, you might want to try just replacing the nipples. Some on this board have had success replacing the nipples and stopping the leak. I tried with mine, but it didn't work. Email me if you have any questions after reading my earlier post.
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2017 DSDP 4054 Spartan Chassis
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