Regarding the Travel Service 734, as it is from a completely different airline, aircraft type, serial number batch and year of production, the chances of it having a recurrent identical fault to any of the aircraft mentioned is slim and so would be reassuring to the lay public.
I think even the next or previous aircraft on the line having the same problem is ALSO very slim. What the hell does that have to do with anything? If one's wrong,they're all wrong!