No actual manifest as far as I am aware but I haven't gone to the archives personally. I just found the Hamburg passenger lists and located the Friedeburg. Can't actually read much of it as it is in German and difficult to see the writing clearly. Here's the link if you have the time or interest to check it out for me. Hamburger passenger lists 1850-1934...1870-1879...direkt bank 024 (5 Jan 1870-21 Dec 1870)Image 142 of 471.
Thanks again. The latest map you posted looked very interesting.