[The Radium King]

remove the transmission fill bolt and stick your finger in - you should be able to feel the fluid. pelican is your freind here:

Pelican Technical Article: Boxster Differential / Manual Boxster Transmission Fluid Change - 986 / 987

perhaps info here also:

http://986forum.com/forums/performance-technical-chat/33349-leak-around-transmission-linkage.html