I don't have much to add to this thread- but.. the three or four '75-'78
Armstrongs I have seen (one on my trailer now- a 78) have service valves as
standard equipment- from the factory- to quote from my '78 service manual
"This unit has been provided with a suction side service gauge port...".
        But- I agree, if it is low, generally there is a leak somewhere.

        And- it uses R-22, which is still readily available- the same that is used
in window A/Cs and most home central A/Cs.

________
        
        Chris Bryant
        Bryant RV Services
        DeLand, Florida
        mailto:[EMAIL PROTECTED]

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