DS3 Crossback passenger door handle stuck in open position

[Alli55]

I have taken the car to peugeot main dealership and an independent garage and they have found no fault the independent garage did say that it could be the handles or the module and I should take it to ds dealership it is booked in on thec11th June will they be able to diagnose it and find the fault as my door handles won't come out on unlocking the car