Serious incident to the Airbus A320 registered A6-ANA operated by Air Arabia on 19/04/2022 en route

Preliminary data based on the notification from the Pakistanese authorities:

At time 0129LT Psition 85Nm West of Karachi while descending through FL350, aircraft initiated MAYDAY call and started emergency descent.
There after aircraft rest squawk to 7700 mergency code.
On inquiry pilot reported cabin pressurization failure and reported no assistance required on arrival.