Check Engine Light/ Engine Service Soon etc whatever you want to call it

What is your question?

So I bought a 09 370z Touring non sport 6 speed Manual transmission. I bought it with 87K miles. CARFAX is clean and car is in somewhat good condition. Everything is dry underneath and no sign of leaks other than the Passenger side floor is soaked. After reading forums it sounds like I MAY have a clogged drain or tube. Would that or something related to this keep the service light on? I got the oil changed and full service done. Just didn't do filters. The engine light is still on and it's annoying the crap out of me. Any ideas?