Continuing odor often times means moisture lurking somewhere. If you have a moisture probe, it might be more helpful at locating the problem than a blacklight, at this point.
Soak and rinse the the effected area with the TCU, using a Water Claw for rinsing and extraction, if you have one. Then I would use a bio-enzyme, injected, to handle any remaining odor causing bacteria. Put a fan on it to help it dry as quickly as possible.
If this doesn't work, they may in fact have to pull the carpet to inspect the subfloor for possible replacement.
Soak and rinse the the effected area with the TCU, using a Water Claw for rinsing and extraction, if you have one. Then I would use a bio-enzyme, injected, to handle any remaining odor causing bacteria. Put a fan on it to help it dry as quickly as possible.
If this doesn't work, they may in fact have to pull the carpet to inspect the subfloor for possible replacement.
Ed Elliott