Thanks all!
Assuming the $335 worth of R12 that was installed last week when they replaced the dryer to compressor line hasn't leaked out of the compressor to dryer line -it went "pssssst" when I moved it around working on something else but stopped when I let it return to its normal position - I'll get it evacuated, get the new line installed (thanks Wilkinson's) and hope for the best.
Otherwise a new 508 and bite the bulled and buy some more R12.
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