Hi
I am not sure if you resolved the issues but if you try the following, go to either of the FMC, then choose
FS Actions
options
key command, there you will see 1-4 pages, scroll through with the next page/previous keys in the scratchpad and you will find DOORS, you will then see a selection for each of the cargo doors including the 77F model, advise your request for each door using ctrl + whatever key you choose, be careful not to use any ezdok keys and then hit the EXEC button on the scratch pad, it will then be saved.
eg...ctrl + F for forward door
you can use this selection for all pax doors as well if you don't want to keep going through the FMC, also takes away the impatient GSX request quicker....!
hope this helps...
Stringbean