Bruce,
If you are in U.K., Hartech is more convenient?They certainly seem totally competent.
Porsche servicing, repairs, engine rebuilds, reconditioned wishbones and cars for sale - near Bolton, North West England.
Having recently done my own M96 rebuild I can confirm the problem of metal debris. But ,I had an LN filter/adapter. So there was very little debris anywhere but the filter :-). My IMS did not fail ,it was the beginning of a c/s bearing failure.
In your case, you might test the debris - is it metallic or not? What colour is it?