By quest chain you mean FATE chain. It starts with Attack on Highbridge: Prelude, and continues on to Act I, Act II, Act III, and ends with Attack on Highbridge: Denouement.
Chachamun despawns when the FATEs start and will not respawn until Attack on Highbridge: Denouement starts.
To get the NPC to stock the Tiny Rat and the orchestrion roll Fleeting Rays, you have to successfully complete Act III, which means protecting all the townspeople and supply crates, and killing Zuzuroon before the qiqirn abduct everyone and destroy the crates.
If you fail the Prelude, Act I, II, or III, Denouement immediately starts.
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Re: Fleeting Rays Orchestrion Roll - Gamer Escape's Final Fantasy XIV (FFXIV, FF14) wiki
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