Here's a must bookmark set of stuff on the AIRBUS A300-600R!
I found a maintenance tech who post about all the things he does. He seems to work for a freight company and has content on MD11, MD10 (Retrofitted DC10), 757F, 767F but more importantly, the A300-600. He has encountered practically every malfunction you could have with it, so it's good info.
He posts on his own forum, where he goes in depth with great pics and vids of that days problem, while also engaging with his community to help discuss and fix said scumbag system (sometimes with shady shortcuts).
All his videos