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I would suggest starting at the vacuum pump and heading out... you might get lucky...
Check your check valves and as old a car as it is.... you might consider putting new lines on from the pump... hard to see a small crack leak on the underside of a rubber hose...
I do not know which type of AC system you have..
but the type 2 and 3 on the 123's ....JUST that dash unit you mentioned taking out .... diagnostics section is 80 ( EIGHTY !!!) pages long.... hope that something can be fixed somewhere before you get to there....
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