leaky injector 79 240D

It's been one thing after another with this car. Just replaced the starter with one we bought from ya'll, and it worked great, then today a leaking injector. Diesel is flowing out. It's the one closest to the firewall/cab. Does this problem describe a bad injector? Is this an easy fix? Any tips or direction is most appreciated.

Thanks! Shelly (Standing in for Pete)

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