I have a 2007 ss750, which is to say we got the same engine. The pics below are of my wife's bike, 2009 ss750, same engine.
I would start with a thorough visual inspection. Start from the highest point.
*Remove the seat, then the instrument cluster (on top of the tank) and then remove the fuel tank.
Front cylinder breather
Rear cylinder breather
Inspect both breather hoses entirely, not just where they connect to the reed valve. If they check out okay, now it's time to go further.
Take these covers off. There are two on top of each cylinder, they are easily removed. Remove all four covers
to expose the (valve covers). *when re-installing, DO NOT
crank these bolts down, they WILL
snap - snug them up, nothing more.
Front cylinder right side cover
Rear cylinder right side cover
You'll clearly be able to see if the valve cover gaskets have sprung a leak, take your time and inspect them methodicallly.
The next level down will take you to the cylinder head gasket(s), and that's a whole different ball of wax
Record your findings and post them.