It's been a while since I worked on a C152 but you might like to check the following:
Remove the lower wing panel forward of the aileron operating rod and look at the cable-operated bellcrank. You'll see that it has kidney slots in it and the extremities act as stops in conjunction with the sides of a sleeved pillar bolt. Does the bolt make contact at both ends of the slot? It's highly unlikely that it doesn't however.
Secondly, look at the operating rods themselves. Are they bent? This is reasonably common if the control lock hasn't been fitted and the ailerons have been blown around in the wind. A bent rod will limit the control movement.
Re the door - have the latch mechanism checked on the next inspection, along with the aileron range of movements.
Hope this helps.