Running costs
Peter,
the 83.18 US$/FH are the hourly reserve for the two kits and the estimated 240 manhours required to carry out the job. Most Robinson Service Centres around the world can do the overhaul. If you take your aircraft to a place where labour cost is lower (higher) you might allocate a lower (higher) reserve. Be mindful that 240 MH is a suggested figure and any Service Centre will use that as a minimum.
The overhaul at the factory is an altogether different process, where the aircraft is stripped down, inspected and put through the assembly line, to include full repaint of the exterior. At the end of the process the aircraft really looks brand new. This of course attracts a higher cost, which is the one mentioned in the Overhaul Price list, but equally a higher value to the a/c.
I hope it clarifies your concerns.