412 Guy - it's not impossible for a transponder to transmit a wrong code. It's happened to me several times over the years.
Maybe beefs, just maybe, but for it to 'wrongly' put out 75



I'd have to side with 412guy;
Not buying all this good pilot BS,
That particular squawk exists for a reason. Why would you set it, or why would the IFF malfunction and emit that squawk without being set?
I don't but this freak IFF accident BS. Someone was a numpty.....
...or someone thinking, I wonder what would happen, especially with all this Olympic malarky going on, if I was to ...........