I think I've read every post in this thread and there are many, many comments about 'faulty' or blocked pitot(s). I've not seen (or maybe missed) comments about the static vent(s). What exactly about the pitot(s) or static vent(s) is believed to have 'gone wrong'? Surely the electric heaters were functioning and switched on?
Hard to imagine that you've even read many posts, much less every one...