forgive me if I'm wrong - but is this the situation ??
the Boeing Service Bulletin was carried out and signed off, thus the repeat inspections of the bulkhead were no longer required.
However some part of the SB was inadvertantly omitted? (Effectively the AD has been complied with... however the SB has not been complied with)
In which case the problem is more of an operational issue....not management?
Edit: Seems someone already made this point on the first page...!