From the entries in this post, I am assuming that you are looking for a pre-purchase inspection, not a pre-delivery inspection. As to the refrigerator recall, you can call Norcold with the serial number and they can tell you if the recall has been done. It sounds like you are fairly familiar with many of the RV systems and can check most yourself. If you are purchasing from a dealer have them give you some kind of guarantee that all systems will be working correctly when you take delivery. (still not a substitute for a good inspection).
The engine, transmission and chassis are a completely different animal. Personally I have no experience or knowledge of diesel systems. I would think that a good thorough inspection by a qualified mechanic would be money well spent. Get the dealer to agree to correct any deficiencies found before delivery. In my case (gas rig) the dealer included (at their cost) a 5 yr service agreement to give me peace of mind. (probably means I paid too much as they absorbed the cost).
Remember, no matter if you do the "house" inspection yourself or hire someone, it is a used unit and won't be perfect. Although you may find fewer issues than the original owner did when it was new from the factory. Use those issues in your negotiations to your favor. When we bought ours last spring there was a tiny rip at the top seam of the patio awning. I probably would have lasted several seasons before it became un-usable, but the dealer replaced the fabric with new as part of the deal.
Good luck in your quest, it sounds like you are looking at a very nice motorhome.
Tom and Barb
'07 Winnebago Voyage 35L
Workhorse W22 chassis FMCA 219315