When player in the tank, or other vehicles, in the actions menu there is no a status of "Damaged". Exist only - ammo Low, Fuel low. At least it seems strange. Thus a player can not call a repair specialist.
As seems to me, it should work the same as in the wounded player.
The player report about the damages and then the commander of this squad, should order the repair specialist or engineer (if they exist in the this squad), to repair the damaged unit.
BIS Please create this