I wonder if this highlighted section from the above report may include the subject aircraft
The aircraft was found to differ from Boeing's design in that a clamp supporting the first officer's wiring to the oxygen mask light panel was missing. The wiring was not sleeved and a large loop of unsupported wire was found. The investigation determined that about 280 aircraft including all of Egyptair's Boeing 777s were delivered that way.
Just remind me, are Boeings built in China ? or the YOU ess of A ? or possibly, in the latter, by the former ?