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The expansion tank is very common and very simple to replace. The PS is another common occurrence and yes, a bit more expensive. Do you plan to DIY any of these? As for the door sill sticking up. I believe there are clips that hold it down. #4 being the sill and #8 being the clips, part # 51711496621. Maybe pull the sill off and inspect the condition of the clips. It may be that you just need to replace one of them.
I would use one of the middle clips and put it on the end, the middle will stay down if the end is bowed up, until you find a another clip
