qldit

Good Morning dgoad, my compliments to you, you most definitely are an "ace" with applied logic and experience!

Your experience feedback will certainly give others clues as to how to interpret problems and also reinforces my own personal limited experience.

And yes, reference the brake boost leakage, isn't that always the way it goes!

From my own experience any use of battery jumper cables should be avoided, I get criticism whenever I insist on removing a flat battery and charging it or replacing it, when those kinds of problems happen.

And yes again, your finding with MAP sensors being interpeted as problematic by codes is inline with mine when in fact they are OK.

I don't really give much notice to codes, but simply consider them as "possibly assistive"

You most certainly had a crash course in these systems!

As you are aware, the spark voltage is always negative polarity, but if you ever get a chance to really get up close and personal with it, you will observe a fine blue centre to the arc with a trace of jagged yellowish (fire) on it's outer edge.
If ever you try this though, use a conventional ignition (points system) in case the electronics in the system may be adversely affected.
(use a plastic rimmed magnifying glass, not a metal rimmed one like I did!!)

By the way, I had a simple brake job recently, just change the pads, when I compressed the caliper pistons discovered leakage in their seals, then discovered the supply hoses were also wet, so a twenty minute job ended up taking a couple of days and became quite expensive! (waiting on parts!)

The old domino situation, don't you just love it!!

Once again, well done!

Enjoy the that satisfaction!

Cheers, qldit.