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Tell me what suction and heat pressures you run on each coil... then valve one coil off at a time and tell me what the pressure reads are... until you only have one coil operating.
I need to know the outside air temperature when you do these tests.
So far I suspect a under charge of refrigerant...
Leaks are best detected with liquid (soap bubble) type leak detectors.
My guess is that you do not have any leaks, but just an undercharge of refrigerant.
Let me know about all that, we can go from there.