Short on time and this only applies if they use the florescent dye inspection method used in automotive/aeronautical applications.

For the system to work, there MUST be at the very least a microscopic crack on the surface itself for the dye to seep in to. If the fault it 100% internal, then it isn't possible for the dye to seep into anything and then be spotted under the black light as a brighter line since there is more dye to floresce along the fault.

This would catch any HT failures quite quickly, however as you have unfortunately found out, it won't detect internal structure problems. <img src="/ubbthreads/images/graemlins/frown.gif" alt="" />

I don't doubt for a second that the Yard will set things right though. <img src="/ubbthreads/images/graemlins/thumbup.gif" alt="" />

If I confused anyone, let me know & I'll post a more detailed explination of the florescent dye system. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />