Health, first, welcome and congratulations! I've had two 139s -- a 2003 and now a 2012, and I'm a fan (as you can see by my screen name).
Second, the original manual for the 139 is almost useless -- it is very generic, with almost no info on the trailer itself.
But third, the manuals that really matter are easily available on the web. So, for example, figure out which fridge you have, and what model. The manufacturer of that component will probably have a manual available. Even if they don't have the 2008 manual, they will have 2009, or whatever. And there is relatively little change from year to year, in most cases.
Finally, be sure to ask lots of questions on this forum -- us old-timers love to answer them, rather than doing the things we are supposed to be doing (like work or chores).
Is this your first RV? Where are you located?
2012 Fun Finder X-139 "Boondock Style" (axle-flipped and extra insulation)
2013 Toyota Tacoma Off-Road (semi-beefy tires and components)