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A/C compressor leak 700

I have a 89'740T with 235K miles. I converted over to 134a last summer with excellent results (38-40 F). This year it appears that the compressor has developed a leak, to leaking down overnight after a recharge and the pressure not high enough to make the pressure switch. The leak seems to coming from the back of the compressor(using an electronic leak detector) where the two steel lines connect to a manifold plate that bolts to the back of the compressor. Is there a gasket/o-ring that might need replacing between this plate and the compressor or is it more likely that the internal seals of the compressor are leaking ?. In either case is there a rebuild kit that is available ?






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