On 8 June 2016, a Boeing 737-800 en-route to Seville had already reverted to alternate automatic pressurisation control when this also failed. Manual system control was attempted but was unsuccessful so an emergency descent followed by diversion to Toulouse was then completed without further event. A similar pressurisation control fault had occurred earlier that day but had not been properly dealt with by an appropriately qualified engineer. Both system controllers were showing faults and were replaced as were a ruptured flexible hose and a series of malfunctioning drain valves. More reliable controllers and routine checking of system performance were recommended.