I noticed another texture error, textures/base_support/aluminum.tga is missing. I couldn't find the texture error anywhere on the map though, so I'm going to assume it's another one of those unseeable texture errors, like what powerupshit was.
Edited 1.04 hours after the original posting.

I have made a pk3 with blank dummy files for the texture... Doesn't look like that texture was meant to be seen... or used... but slipped into the final anyway through that particular shader. EDIT: It's up on all of TheMic's maps.
Edited 12.4 days after the original posting.

Turns out the missing texture is in Q3Test 1.09, Tig. I'll have to go check & see if there's a shader related to that, & maybe I'll put a pk3 with the texture & it's shader up here. EDIT: Doesn't look like it's there, so please disregard.
Edited 3.24 hours after the original posting.

The mapmedia.pk3 - lvlworld.com/mapmedia - does fix all but one of the missing textures. I've have updated the review to include this info.

Is it possible mapmedia.pk3 fixes those missing textures in the map? I guess so, but the only way to find out is to download & run the map.
Edited 1.8 hours after the original posting.