one missing railing on a new construction and you call it a C6? that sounds like a stretch and a half. a missing railing is not deferred maintenance or substantial damage, which is exactly what C6 states - The improvements have substantial damage or deferred maintenance with deficiencies or defects that are severe enough to affect the safety, soundness, or structural integrity of the improvements. The improvements are in need of substantial repairs and rehabilitation, including many or most major components.
could the missing railing be a safety issue? definitely. is it a safety issue as a result of deferred maintenance? absolutely not. the key is that the definition specifically states the bolded above.