1. I don't think you can if looks alone won't do it; however you can ask the dealer if the recall has been performed. Whether it has or not, ask that they do it since the part has failed anyway. Contact SOA if necessary. Subaru should not be selling cars with fuel coming out the lines.
2. Find and fix I'm afraid. Could be the clamp. If you replace a line or open the system, burp the system thoroughly.
3. Could be normal; the front diff is open, but there's a central diff in there too. Can't say from a distance, sorry.