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Product Asset Tag (p 5) and the repeated custom "Extra" fields (Product Extra p 7, Board Extra b 5/6/7, Chassis Extra c 2/3) from the Inspur FRU field doc weren't writable — ipmitool prints identically-named lines for each custom field with no index of its own, so a plain name lookup couldn't tell them apart. parseFRUOutput now counts occurrences per area to recover the real index, and the existing area/index round-trip in the FRU editor write path picks it up automatically. Out-of-band (-H/-U/-P) writing remains out of scope. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>