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We review the fault tracking system used by Subaru Telescope operators during night observation, from first light in 1998 to present. Over the years, there was an evolution of format, features and software that culminated in a major revision in 2017. The current revision is LAMP-based using MySQL and PHP, and includes all past faults, pictures and comments. We attempted assigning faults to in-house experts, maintaining a status for each fault from initial report to well-considered solution, multi-language support, displays in both HTML and simple text format, and promotion of more successful solutions over less successful solutions to the same fault. We succeeded in full text search for whole words and substrings, multiple search criteria, and categorization of one fault to two separate subsystems. In the current revision, emphasis was placed on removing obsolete or unused data structures, providing in-memory tabs of the most recently used fault/solutions without repetitive queries, and adding Like/Dislike buttons with cumulative totals for suggesting the most successful fault/solutions across all operators. The current Subaru Fault Tracking System (FATS) is composed of 1440 fault/solutions, 198 pictures, 2453 comments, and is often the first and only resource required in support of night trouble.
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