Check under the carpet/liner in the trunk near the tank for wetness.
Replacing the tank with an original Porsche part is recommended. Aftermarket tanks have often proved to be unreliable; you don't want to do the job twice!
DIY tips and videos abound. You might want to tackle this job, it's not as daunting as many make you believe!
__________________
James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow!
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?