I was underneath my L3010 today lubricating the hydrostatic linkages for the pedal and noticed a small hole in the casing..pretty sure from the way it looks it's factory made hole and it almost looks as if you can see in through it but I can't tell if it's a dead end or not. First I thought maybe a drain off for water it may take on somehow 
It's underneath on the passenger side ahead of the mid PTO
It's underneath on the passenger side ahead of the mid PTO