The PMD (pump mounted driver) failed.
The plug between the fuel pump and PMD was bad and had to be replaced; pull the intake manifold off, replace parts, new gaskets, and then re-install (not very easy)
Replaced all brakes, typical for a truck this size, however the rotors & hubs were shot.
Glow plugs & glow plug relay three time! That is just poor design as they continue to not perform and every other diesel out there can in cold weather.
Both front power-lock controllers and handle parts within the doors.
Washer fluid reservoir as well as washer fluid pump for rear wiper.
A couple misc. switches inside; nothing different from a GM truck.
I love these trucks, in fact, I still have a 1994 Suburban with a 454 tbi and will run that truck into the ground as it has 203k right now. I bought this truck for the mpg and the power of the diesel. I do feel the power is that, as it runs better than the big blocks and the 350 in high-altitude/mountain passes is a joke (although it is not a Duramax/Cummings/Powerstroke). However, over the last 3-4 months I have far too many issues relating to the engine itself.
We use this truck for our cabin and it gets cold up there. I usually plug it in (and all the time while in town) but when I cannot, it will not start at all. Had the glow plugs and relays replaced so many times and nothing works. Even when plugged in overnight, it is difficult to start while my friends' Cummings kicks right over without being plugged in.
I have also had issues with the Auto-ride 4wd system. I love manual shift, they never should have made electronic 4wd an option in a 3/4 ton truck!
Bottom line, the 6.5 TD is a disappointment. I had high-hopes for it however it cannot hold up as a reliable working engine. I am sure it would be fine on highway and last a long time, but for towing, cold starts, and mountain driving I am going back to the 454.