It is possible that the door on the Fiat Brava is stuck because the latch is bent. It may take a professional to change out the parts.
There is probably worn plastic insulation on a wire exposing the copper conductor. This can be hard to find. Check all wires for circuit in question looking for exposed wire/ worn insulation.
Depends on the condition and service history
Check that the drive cable ends haven't rounded or the small drive unit where it plugs into the gearbox has not stripped, some are plastic.