...a few incidents with 737 Jurassics (-100/200).
I think u meant 727
the only 737s involved were -300 (still extremely rare for wing engines)
The problem was mostly corrected when they changed out the type of dump valve to something that wouldn't clog as easily with nappies and coathangers. We couldn't mandate the valve but chose instead to mandate the aircraft servicing with the old valve to something that was difficult to perform (of course I don't know what happened about this one
