A support device for supporting the body of a person, the support device comprising: a top layer comprising at least one individually inflatable cell (108, 110, 112), inflatable via a pneumatic inflation and pressure regulation device; a bottom layer, arranged to support the top layer, the bottom layer comprising a at least one inflatable cell, inflatable via the pneumatic inflation and pressure regulation device; and a pneumatic inflation and pressure regulation device comprising a controller and a compressor, pneumatically coupled to the at least one inflatable cell (108, 110, 112) of the top layer and to the at least one inflatable cell of the bottom layer via a manifold, characterised in that, the manifold comprises: a plurality of isolation valves (216, 218, 220, 228) configured to enable the top layer and the bottom layer to be isolated from each other and from the compressor; at least one exhaust valve (222, 224, 226. 230) pneumatically coupled to the top layer; and at least one exhaust valve (216, 218) pneumatically coupled to the bottom layer; and wherein, the controller is configured to: determine if there is an air leak from the support device; upon determining an air leak: determine the layer which has a leak; isolate the layer which has the leak from the other layer and from the compressor; and open the exhaust valve (216, 218, 222, 224, 226, 230) to the layer which has the leak. a top layer comprising at least one individually inflatable cell (108, 110, 112), inflatable via a pneumatic inflation and pressure regulation device; a bottom layer, arranged to support the top layer, the bottom layer comprising a at least one inflatable cell, inflatable via the pneumatic inflation and pressure regulation device; and a pneumatic inflation and pressure regulation device comprising a controller and a compressor, pneumatically coupled to the at least one inflatable cell (108, 110, 112) of the top layer and to the at least one inflatable cell of the bottom layer via a manifold, characterised in that, the manifold comprises: a plurality of isolation valves (216, 218, 220, 228) configured to enable the top layer and the bottom layer to be isolated from each other and from the compressor; at least one exhaust valve (222, 224, 226. 230) pneumatically coupled to the top layer; and at least one exhaust valve (216, 218) pneumatically coupled to the bottom layer; a plurality of isolation valves (216, 218, 220, 228) configured to enable the top layer and the bottom layer to be isolated from each other and from the compressor; at least one exhaust valve (222, 224, 226. 230) pneumatically coupled to the top layer; and at least one exhaust valve (216, 218) pneumatically coupled to the bottom layer; and wherein, the controller is configured to: determine if there is an air leak from the support device; upon determining an air leak: determine the layer which has a leak; isolate the layer which has the leak from the other layer and from the compressor; and open the exhaust valve (216, 218, 222, 224, 226, 230) to the layer which has the leak. determine if there is an air leak from the support device; upon determining an air leak: determine the layer which has a leak; isolate the layer which has the leak from the other layer and from the compressor; and open the exhaust valve (216, 218, 222, 224, 226, 230) to the layer which has the leak. determine the layer which has a leak; isolate the layer which has the leak from the other layer and from the compressor; and open the exhaust valve (216, 218, 222, 224, 226, 230) to the layer which has the leak.