What has often made the situation difficult for the customer (and for anyone troubleshooting these problems) is limited access to and understanding of troubleshooting tools and techniques.

由于难于获得和了解故障检修工具和技术，用户(及任何解决这些问题的人)经常陷入困境之中。

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This is very useful when troubleshooting performance problems and memory leaks.

这在故障诊断性能问题和内存泄漏时非常有用。

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Finally, we will provide some tips for troubleshooting security problems.

最后，我们会提供一些关于安全性问题故障诊断的技巧。

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This not only makes troubleshooting problems difficult, but it also means that if Google changes something at their end, it could break Mailbox.

FORBES: Thoughts On Mailbox App

When mechanical problems occur, pilots rely on what's known as the Quick Reference Handbook -- an electronic checklist for troubleshooting.

CNN: Why Dreamliner batteries worry experts