Hi again...
Was no problem to help. My first attempt to research in Germany so it was a learning experience.
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The following link seems to be the easiest way for a Brisbane-ite to view an LDS microfilm...
https://www.gsq.org.au/index.php/services/lds-filmsLoaning the microfilm(s) is free but shipping it/them from Utah to Brisbane costs A$7.75 per microfilm. You can do the ordering from the microfilms link I gave in my previous reply. Film no.69335 for Carl and Marianna's wedding
(heiraten) and film no.69336 for August's baptism
(taufen).
Please remember that I've no proof at all that the marriage or birth(s) happened in Malchow. I'm just making an assumption because of the 1867 census. If the assumption is wrong you'll be the one out of pocket and none the wiser.
And another warning although you most likely already know. The parish registers won't be written using our Latin symbols (Aa Bb Cc etc) but something called the Germanic script, of which there are three versions. You'd do well to read up on it before you try deciphering the parish registers.
And assume the microfilm-viewer won't save images to a thumb drive so take a camera and a magnifying glass when you go to view the microfilm. Take photos of every page you can for later reference. And when someone is watching you take out the magnifying glass and pretend to inspect the register. It makes people think you know what you're doing (works for me)

All the best
Beg