I have been trying to figure the doors. I can open the main front door and the air stairs but how do you open the rear door and cargo door???

Steve,THere is a problem with high-end add-ons and the default FS key combinations i.e. SHFT+E+2. THe reason being that the sim is passing so many variables along it will split up the key combination sent, thus the sim will never see the right key combination. Enough about this.The default key assignments for doors are SHIFT+E+1, or just SHIFT+E for main doors and SHIFT+E+2 for the rest of the doors. You could try a key assignment without the SHIFT, but will be likely to fail as well.If you have the 800/900 upgrade you can assign doors in the PMDG menu. NOT the FS key assignments. This will rectify the problem.And last. There are gauges that can do this for you. Do a search for this on this forum and you'll get plenty of advice.Hope it helps,