Ronnie123
Possibly you might find the Aerowinx Forum to be of interest. It is a support forum for a procedure training software specifically for the Boeing 747-400.
http://aerowinx.com/forum.cgi
Several maintenance people and also some current or former pilots frequently visit this forum. You should try the search function when researching for anything specific. Many highly specific technical and system details have been discussed already.
You may consider asking questions yourself.
Little in the way of technical specifications for the type to be found there, though.
Sn