I'd be surprised if this has 500 hours on it.
It sat for a LONG time in one of our machines that pretty much never got used. That got torn down and this was put into something that would see more use. At that time it got one new injector, it was stuck. Was 100% after that. Used for maybe 100 hours a year for a few years, then parked again But, has only been started occasionally in the last year or so. I'm not sure if they started it again before the second build was taken apart.