They were together 1st thing this morning (being observed by a couple of keepers) and appeared to be having a great time. Tiga seemed to be instigating play by climbing onto the low beams and peering at Rajang, then jumping on him ..... whereupon they rolled around for a bit. Then, as Tiga retreated back onto the beams, Rajang slapped his head a bit - but very casually, not forcefully - before wandering off towards the hatch to the outside ....... followed by Tiga in hot pursuit. Rajang was then distracted by a pineapple en route and didn't actually make it out (still have never seen him out there) but Tiga went outside - though didn't use any of the equipment while I was there.
(will post up some pics of them together tomorrow)