The structural damage on 27799 was actually caused by a collision with an Interdeck in Aberdeen bus station over a year ago, it was never properly repaired and it seems they've only decided to take it off since there are now E300s spare.
You can see in this photo below how the offside corner is quite badly deformed. Additionally most of the internal fittings in/around the cab are either cracked or partially missing with the main body frame exposed in places. Quite a poor show really that it was never repaired properly and has been on the road in such a bad condition for over a year.
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27601 is currently inside the workshop at Stonehaven undergoing service prep.
The Enviro400s especially the 57/58 plates shouldn't be on that sort of work anyway. According to internal sources Bluebird are looking to get new vehicles for the 35 in the next financial year, the plan i understand being if approved the existing 35 fleet would move to Aberdeenshire replacing the native 57/58 plate Enviro400s which are not Euro 6 and therefor need replaced before the implementation of the new LEZ zones. However it is still subject to approval from higher up within the group so may not happen...