So put my 150 into reverse - rear-view mirror camera screen goes blue then blacks out - assume faulty camera - or anyone know cause of that particular symptom?

So to get to have 'break' teh Ford cover plate? can i get in from rear by removing panel?

Oh and have tried re-seating the plug to the rear-view mirror

 

check the connector at the tailgate too.

 

but you have to remove the cover plate to get to it - and others say cant remove without breaking tabs ?

 

The connector at the tailgate is actually behind the bumper by the spare tire. Follow the wiring harness coming thru the body and you'll see it.
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yes traced it back - connections all taped up and solid - so guess my soddin camera has failed?

 

More than likely yes, bad cam.
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you happen to know if warranty covers them? (purchased 2105 27k on odometer)

 

Covered under the 3/36 and under the Ford PremiumCARE ESP minus your deductible for however many years/miles you bought.

 

This^^
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I bought a replacement on eBay or Amazon for 50$ I think. Also bought the wiring harness that goes from spare tire to tailgate just to get new everything. Mine works great now.