A plausible explanation: Crew operate into ADL with NIL defects. It is common to fill out all sections of the coupon during flight and leave the report section blank until after shutdown. Before MOD, the crew would fill out NIL defects prior to passing the tech log out the window.
Since MOD, the tech log doesn't get passed out the window, so it is conceivable that during this transition period the crew forget to write NIL defects, and as they are transiting on the same aircraft they don't check that the tech log is complete before departing on the same aircraft.
On the next sector to SYD they have an MMR failure. The other pilot is PNF this time, so he opens the tech log to write it up. Before MOD it was not normal to see the white copy of the previous coupon because it had always been pulled by the engineers at the previous port. The PNF sees that the coupon has already been partly filled out and assumes the other guy did it earlier in that sector. He reports the failure in that coupon and at some stage later on or after shutdown they realise that they have reported the defect on the wrong coupon. They correct the error in the correct way: that is, they use the EIE protocol so that it doesn't look like anyone is trying to cover anything up.
This is a very probable scenario, particularly while the crew are still coming to terms with this MOD stuff.
Last edited by HF3000; 9th Nov 2012 at 10:39.