My replacement Superchips arrived and,when installed, the car started right away!
I wonder if years of having the car tuned with the Superchip have resulted in the ignition/fuel settings becoming "customized" to the Superchip? Why else would the stock chip or PAD chip not work on the car?
I am a happy guy now :p
Thanks to all who offered advice and help on the forum and privately. Thanks to Benzmac for sending a replacement LH fuel module. I don't need it now but what a great bunch of people here at Mercedesshop.com