It seems that automotive design (all brands) has been shifting away from serviceability for quite some time. Nowadays, more mechanics are lifting the cabs when these diesel engines need serious work, and what should be simple tasks require major disassembly to get to the part. I watched a video a week or so ago about a simple sensor replacement on a Dodge Ram gas engine, that had an 8 hour shop time associated with it. Over a hundred bolts/nuts/screws and a truck bed full of panels had to be R&R'ed.