N1, Thank you for the kind invitation but I hope you won't be offended if I decline - unless we're headed off to Dusk to Dawn afterwards
Before RAF pilot training, I was a seagoing marine engineer, both diesel and steam turbine, so fiddled around with all sorts of engines - except gas turbine.
I'm not disputing the possibility of the forward bearing seal leaking or contamination taking place in the packs and I wonder what opportunities exist for contamination in dedicated compressors.
My view is that this is, in the aircraft I've flown, a very rare occurrence. I'd heard of the HS146 but not of any of the suggested problems with the B757 which I flew for five years.