Unlocked *stock* part missing in VAB; how would you debug?

[kingoftheinternet]

My FTX-2 External Fuel Duct doesn't show up in my parts list anymore in the VAB (not in Fuel Tanks, or the custom category I defined for it, or while searching for it). It still shows up as researched and purchased in the tech tree. There's nothing in the output log relating to it, and nothing incriminating-looking in any of the mod files that mention it. I've verified all the stock files through Steam. Restarting the game didn't solve it.

What else can I do to figure out what's going on, besides remove all of my mods (which I consider basically not an option)?

[kingoftheinternet]

Never mind, SETI Community Tech Tree 0.9.0.2 moved the fuel line higher in the tech tree, and it was erroneously appearing under its old node (probably because I'd unlocked it already I guess).

[Wolf Baginski]

Windows Search can help, at least letting you confirm where the files are, although it is confusing that so many people, not just the Squad developers, use the part.cfg filename. In Windows 7 the search in Windows Explorer will work on words inside .cfg files.

In this case it should also find entries in Module Manager command files.

I admit to being wary of auto-update methods such as Steam and CKAN. I have a suspicion about the new version of one Mod.