I'm sure Kudu can give the correct answer of when the zoo exactly tried to start breeding Jati with Sabu after his return, but this is just to give you an estimate.
I'm sorry! I just now saw this!! But to answer the question, Sabu returned to the zoo in late 2007, went on exhibit in August of 2008, and I do not believe he was fully introduced and put out with Jati again until early 2009.
That said... Jungle Trails update!
The "super troop", as the zoo has coined it, of bonobos, consisting of the zoo's four adult females and four youngsters, will remain on exhibit together through Sunday November 15th. After that, new females Lana and Kesi will be introduced to Vernon, per a breeding recommendation, and the other females will be split amongst the zoo's two other males, Virgil and Vim.
Secondly, as Moebelle has already stated, the zoo has switched to red lighting in the aye-aye exhibit in an attempt to make them more visible to guests and more active in general (due to the fact that do not see the red spectrum as bright as the blue), and so far, this has seemed to be working! There has been increased mating behavior witnessed since the lighting change, and the zoo is hoping for baby aye-ayes in the near future (finally!!).