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Occasionally, problems with the fridge will require a few tests to
diagnose. Before contacting Oxford technicians, you should conduct
these tests, since they will ask you for these numbers anyway.
First of all, you should prepare the system:
- Perform a full scrub of the mixture. [sec:maint.scrub.full](See §7.4.2).
- Clean the 77K trap. [sec:maint.clean77trap](See §7.2).
- Clean the 4K trap. [sec:maint.clean4trap](See §7.3).