Steve, thanks. I read your DIY post, very helpful.
so I will assume, if nothing else is wrong, I should aim for EHA values closer to 0, and tweak the lamda screw a tad CW to see if I can drop that 7ma reading down a bit.

I assume also that if I do that, then the warm startup mixture will be a bit richer, and all my problems will be behind me.

I'll try checking the pulse-width signal as you suggested.
I hope I can use that approach for general checkups of the
system - it's much more convenient than the EHA check.

Tks.