Yes, gaunty , I remember the incident. That was one of the first human factor real life "examples" at the time. Every capital city in Australia had their DME allocated channel 5. Perth, however, was allocated channel 2. Pingelly, the station that was 60 plus nmls east of Perth was channel 5. The crew tuned the DME to channel 5 (presuming Capital city) and that was it, proceeded to let down on that station.
Only the situational awareness of Perth ATC saved the day. They thought it strange there could be such a large difference in descent points between two 727s, on the same route, headed for the same destination and eventually asked questioned.