[Nickosport]

You're best off with letting the dealer fix it under warranty. IIRC the seal between the bell housing and trans is not a wet seal, so it must be leaking from seal in front of the shift linkage. Either way, the trans will have to come out to replace the gasket or reapply a silicone sealant. Unless you just want to drop the trans yourself, id let the dealer do it.

Can you post some pics? I havent heard of any of the MT cars leaking trans fluid, so this is probably an isolated issue. The dealer may decide just to replace the trans. I know dealers can't repair things like synchros and broken gears, but I'm not sure about their capability to fix your issue since it sounds relatively simple.