I posted recently about the evacuation of the Boeing 737 that effectively exploded in Japan and how how a well-executed operation contributed mightily to everyone living to tell the tale. Coincidentally comes news of a 737 evacuation that didn't go nearly as well, although ended happily.
This report covers an incident with a SAS 737-600 (the short one) which experienced sufficient evidence of a possible on-board fire to ensure the pilots landed immediately and evacuated the aircraft.
However, none of the doors and slides on one side of the aircraft operated. The investigators worked out the technical reason why not, but at time of writing a fix was still being developed. As they point out, in other circumstances this could have been much more serious.
It reminds me of the A380 evacuation trial for certification that I took part in - on that occasion EASA and the FAA had disabled all the doors on one side, unbeknown to us inside. The certification rules require that half the doors be disabled, although not necessarily all one one side.