2002 Explorer Evaporative Emission System Leak

[MyExplorerandMe2]

I’ve had it smoked. Could not find the leak. Replaced the gas cap. Erased the codes and they came back.
Anyone have any ideas for my next move?
Here are the codes. PO455 & PO457

Thanks

 

[Number4]

The leak could be on top of the gas tank. Depending on who did the test, may be hard to spot.