It appears that not only is Diyas al-Yat unable to repair a broken Profatrix Mask, but he's scared of them as well:

You allow Diyas al-Yat to examine your Broken Virindi Profatrix Mask.
Diyas al-Yat tells you, "No, no thank you. I don't like the feel of this one."
Diyas al-Yat shivers.
Diyas al-Yat tells you, "You might try that ... Virindi ... in Yanshi."