Taking the cover off is a big job compared to changing the chain and other things, but I don't think that there's really a choice, assuming that you got "lucky". I wonder if some pieces wound up in the oil pan.
Keep in mind that as far as I know, any 117 engine valve covers will fit. On eBay, 380/560SL valve covers are very expensive. SEL valve covers are cheap! But ask if they are cracked - I got a set (to polish) with - guess what - the left valve cover cracked - seller "didn't notice".
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