Interesting you say that, had a gang on one of my jobs last year, they had an E27, I never saw it, so it could have been a Z.? They got a loaner E26 from the dealer, as their new 27 had a twisted boom. Well thats what they thought anyway, up shot was, as you say, bucket not level! A long way out buy what they said. I think they assumed it was the boom, I suppose it could have been the dipper, king post or even the main frame? They waited literally months for it to be sorted, story was that they couldn’t supply parts because they were all the same, twisted! What a clusterfuck!
I assume the current machine is under warranty? What’s the dealer say about it?