Yes, my friend was travelling on this flight (no. 5251), and heard this call. Apparently, there was an announcement that there was a pressurisation fault with one of the engines, which meant the aircraft could not fly above 18,000 feet.
She reported that it was quite obvious that there was a fault, as the aircraft appeared to struggle to get off the ground, and climbed at a slower rate than normal.
Apparently aircraft landed safely, no injuries, but some passengers disembarked at Malaga, and refused to carry on with journey.
Still not sure what a code bravo is though.
Could try a post on the cabin crew forum.