what do you mean by this? Did you delete the "Authorize Express Checkout" and "Process Express Checkout" Binding groups from the bindings panel on the checkout failure page?
or did you delete the "Authorize Express Checkout" and "Process Express Checkout server behaviors from the server behaviors panel on the pp_confirm.php page?
from your wording, it sounds like you deleted the server behaviors.
did you read the "Debugging eCart transaction failed issues" tutorial on the eCart support page?
the general gist of the tutorial is to open the pp_checkout_failure.php page. Go to the bindings panel, click the plus button and select eCart -> Checkout -> Local Checkout Checkout response.
then from the list of gateways, select the appropriate one, in your case
"Authorize Express Checkout" and "Process Express Checkout"
this will add binding groups to the pp_checkout_failure.php page to get information back from the gateway on why the transaction is failing.
from the bindings that are added to the bindings panel, you select the Long Error Message binding and add that to the pp_checkout_failure.php page.
the Universal Email behavior is added to the confirm.php and pp_confirm.php pages