(29 Dec 2019, 4:07 pm)Dan wrote It's been off service with engine failure since 28 May - used in service at Chester-le-Street from 19 May until this point - so yes, albeit briefly!
Believe it's now nearing completion (with an engine donated from one of the ex-Metrobus OmniCitys acquired earlier this year), but 5234 (withdrawn/awaiting transfer to East Yorkshire) and 5241 (Riverside) have been off service with similar engine issues since 2 October and 8 October respectively.
Citaro 5275 also long-term VOR for engine replacement, unsure what the issue is now as I believe it came back North a few weeks ago.