Final answer:
The rotating shaft seal is the part likely to leak in a refrigeration unit with an open drive compressor that has not been used for a while.
Explanation:
Rotating shaft seal is likely to be the part of the system that leaks in a refrigeration unit with an open drive compressor that has not been used for several months. The lack of use can lead to dried-out seals or gaskets, causing leaks when the system is restarted.
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