Two months ago, 4539 caught fire while in service. Thanks to Joe Butler finding a couple of web sites, we can piece together what happened.
On June 9, 4539 was in revenue service on the 116 heading from Granite Run to Chester. At around 2:40pm, the bus caught fire while on the Neumann College campus. Green Ridge and Aston-Beechwood fire companies from Aston Twp responded to the scene. Pictures of substantial fire damage to the rear of the bus can be seen at both site.
Suffice to say that 4539 appears to be a total loss, and may very well become the first of the ElDorados to be scrapped.