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I sent this in PM to dieselkane earlier:
Tensioners were problematic with the 08's... TYPICALLY the main belt tensioner, not real often the AC belt tensioner, but just because I haven't seen it, doesn't mean it can't happen.
Look up from underneath at the tensioners...make sure the pulley isn't leaning towards the front of the engine.
There was also a TSB on the idlers but that's for cold start squealing.
Also -- might be worth a try to do two things. 1: watch the AC compressor while someone cranks the engine. See if the clutch (the hub on the front) comes on during crank for a few seconds. This is called CASS or Compressor Anti Slugging Strategy. It's to prevent the accumulation of liquid refrigerant in the compressor after it sits (since the compressor is at the bottom). Also, after the truck sits, before you start it, reach up and turn the clutch with your hand (the hub on the front of it). See if it's tight to turn. This can indicate a failing compressor.
Aside from that, not much more I can think of offhand.
Hope this helps!
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
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