yes - they can - happened to my buddy WayneThe TrailAnd then The wrecker
Go to diesel place and find a replacement there. Mine leaks but only when it is cold and since I don't look for work to do on my truck that it drips only when I park it outside in the winter then I don't really let it bother me. Someday I'll fix it.
The silver lining in it all ..... is that at least you know you have the issue addressed and you know how it all comes apart - and hopefully how it all goes back together