I've never found myself rooting for someone else to pass an emissions test as much as I am for ps2cho right now. Would the gas cap fail be due to a leak in the vapor capture system canister leak or rubber hose fracture?

Best wishes on your next try. Some great advice in this thread.

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88 300e
89 300e
93 400e
93 500e
77 308 GTB

The variation in the results for retests tells me that testing is unreliable and they should set the limits higher. This testing is a crap shoot. At least they are letting you retest as much as you want which is the only positive thing.
Good luck.

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2010 ML350 Bluetec
2012 Mustang Convertible