I used the 3d editor to put the axes at the correct position then I reset the position with GSX menu. Unfortunately it kept asking me to open the doors when the loaders gets next to the doors.
Just correcting the door's positions, doesn't make GSX stopping to asking to open doors. If the airplane doesn't have animated doors, you must set the door to be "Ignored" in the GSX configuration editor.
This, of course, if you want the door to be just Ignored.
If, instead, the door IS animated, but it's using a NON STANDARD variable, then you'll have to put a custom XML espression that checks the custom XML variable used by that airplane. You might have a sample how they work, if you have another fully supported airplane, such as the PMDG NGX or the CS727, 777, etc.
This might not be the easiest thing to do, sometimes the variable used it's obvious, because the airplane Gauge has been written in XML, so they are fairly readable. In other cases (this is usual with Captain Sim), gauges are written in C++, so it might be way more difficult to figure out custom variable names, so it might be easier to just set doors to be Ignored.