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Hello, it sounds like a leaking compressor. If the system was overcharged both the low and high sides would read higher than normal pressures. Its cross leaking inside the compressor causing the low side to read higher. Other possible issue is if the expansion valve is sticking, which could be due to the compressor falling apart. If you replace the compressor the drier and expansion valve should be replaced together. Most auto parts stores require replacing these components so it will have a warranty on the compressor.