On MSNBC, a F9 (Frontier Airlines) A318 is bruning fuel to make a landing at John Wayne airport in Southern California.  I thought the pilots would look over this before takeoff?

But someone pilot from CNBC said it could be tha it opened a little in flight.  Good coverage saw a 737-800 land and a United 757-200

Beef, read the frigging subject, or do you want me to translate for you?
Ok, A318 has a cargo door open, and is currently burning off fuel so it can land without exceeding MLW.

Now, that wasn't hard, was it? 

Much ado about nothing, or so it seems...

If the ECAM gives a warning memo and it's a false one...maybe one of the SDAC's (system data acquisition concentrator) circuit breaker has been tripped.
Funny thing is, some of those CB's arent monitored by the ECAM, no warning will therefore be given that the CB is tripped.

The Flight Warning Computer is programmed after logic, it cant think or use sound judgment. If the door open warning is generated because of a tripped CB, it will still be shown on the ECAM.