Land Rover Repair: 1995 Land Rover Discovery, land rover discovery, door latch

Question
I have a few questions actually.  1) My passenger front door will only open if both the interior and exterior handles are used at the same time why and what is the fix for this?  2) My driver door will not open when I try to open it more often than not, like its thinking about opening and then it will pop open. It opens fine from the inside why? 3)My rear sunroof is loose on the track and will not open without a little push up wards on the glass what is the fix?  Thank you for all of your help in advance.

Answer
1) You almost certainly need a new door latch.  About $150, and a significant hassle to install because you have to take out the window frame for access.

2) Same as #1

3) The sunroof may be falling apart (fasteners loose) or the tracks may have failed.  To fix it you have to take down the headliner and then take the roof assembly out of the car.  Land Rover actually has a whole updated roof to address those and other problems; so it's probably that or the tracks.  4-6 hour job.