The level bung is at the front level ground and fill till runs out. Get it on level ground take out the bung at the front of box 24mm and see if any excess comes out and report back bud Clean it down as well and recheck leak
Ah could do with more info on that one This corolla is awesome scroll down don't click the link http://www.toyotagtturbo.com/forums/showthread.php?78922-A-mates-Corolla