[Tannaton]

If Volvo do come back with the conclusion that a new gearbox is required, then I would suggest your only alternative is a gearbox specialist.

Automatic gearboxes need fluid at pressure and electronics to work - they can only really be diagnosed whilst still in the car - unlike manual boxes. Hence you need to take it somewhere who has done a few before and can diagnose it.

A new box from Volvo might not be as expensive as you fear and will come with a good warranty.