.....We still have yet to learn how to service the hydrohot diesel ourselves too so if anyone has done that we would greatly appreciate any advise. Thanks again! This forum has been so awsome! 
My suggestion would to be watch Orman Claxton do it. If you are not near where he is, there are lists of "trained by the factory" technicians scattered around the country. Be forewarned that some shops may claim they are "authorized" but the tech they sent to school may have moved on.
The reason I suggest you watch someone first, is that the HydroHot is a very complex system made up of German and USA made components. Normal service included a filter and nozzle change, but also some sensor cleaning and igniter adjustments.
One of Orman's competitors maintains a website and an online parts business. If you subscribe, you have access to service and troubleshooting checklists.
