depressurising the cabin from outside
A/c in short term parking condition, ditching button pressed, cabin technicians connect ground a/c unit, close the doors and cabin is now pressured XD, they cant open the doors from the inside, so they call us up, what we did was turn off and disconnect A/c unit, open avionics vent inlet/outlet then slowly unlatch cargo door as instructed by the engineer.
is there a faster approach to do this or that was all that could be done ?
a/c is A320