Mine was leaking last year after I replaced the coolant. Then I added in some bars leak (As the manual states they do from the factory). Then it seemed to go away. 2-3 trips and no leaking.
Now I took it out today for a ride around the yard after it has sat for 2 months and I noticed a bit coming out of the weep hole again. Not enough to even drip onto the garage floor but it was leaking.
I'll just keep an eye on the overflow bottle and see how it goes.