Our 2015 Seneca 36FK hit the 10k mile mark. the manual says it needs it's first service at that mileage... I asked a good friend who is a Service manager over fleet operations for a huge construction / trucking company - he says they charge $310 for heavy equipment and trucks. He said to call Freightliner to get their cost.
So - I called Freightliner of Utah (Warner Truck Centers) - They told me that because the Seneca is on the M2 chassis, we don't have to make our appointments as a Motorhome (they treat it as a fleet Truck) and we can just drop in anytime for a 2-hour express service. That's exactly what I did and they did everything - all of the filters, oil, coolant, inspection, scanned for recalls, Chassis Lube, Coolant test, Oil test... I mean everything... for $206.00 out the door.