That's quite a catalog of seriously bad maintenance!

The plugs are kinda forgivable as new ones can work loose if not checked, I always torque them down once, then back them off before finally tightening them, that flattens the crush washer and as a rule prevents loosening due to heat cycles.
How it's survived the bottom pulley being loose is beyond me... Divine intervention maybe. Does make me question if 450NM is really necessary, perhaps it was some sort of in joke between the design engineers. I encountered one on an C3 100 that was no more than 80 NM and had been like that for a very long time, I undid it by accident while working out what combination of tools I needed to do the job.
That PAS pump bracket would really piss me off, what a load of hassle to do a simple job!













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