Dagger Dirk,
Have you ever been in a 757 e&e bay or even a 757 come to that! The utter tosh you wrote there is typical of the uninformed bull***t written by people who do not know.
757 IRS's are hard wired through their back plates there are no connectors to swap. It is only possible to swap units not individual connectors. TOGA press does not reset the IRU's, it acts as a mark, a start point for the IRU (runway threashold is usually the datum for IRS PPOS).
I personally, without all the facts, have no idea what caused the multiple system failure (and I have 17 yrs B757 avionc experience) I do know from personal experience that the internal politics within RNAC makes it very difficult to do the simplest things (like getting spares from the store).
For me I'm glad they got it down safely, and will wait for more info before I speculate.