[diesel_mercedes] Injector Leak

 

Can an injector leak in the middle? I know about the leak from the rubber tube that drains the diesel back into the fuel and those replacements. And I think I know about the compression washers that crush down to create a seal between the injector and the cylinder head.
And I know about the potential leak from the fuel line to the injector. But, is there a third location and option for a leak in the injector body itself? If so, is there a fix, or is that a sure sign of replacement.

If I replace, do I replace all?

My rear most injector is leaking, the one closest to the firewall.

Chip
Houston

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