What other places besides the gasket can cause a transmission leak. on 2005 Cadillac Escalade

I already changed the gasket and I am still having some leaks. Not sure what to look for or where

could be leaking at the pump where the torque converter is, shifter linkage seal, gasket between tranny&transfer case(if it's 4x4) or could be the rear seal where the driveshaft goes in. either way, i would get a tranny shop to check it before it causes some expensive damage.