While I haven't been officially told, I did a run of TT 3-3 the other day. I found 3 summonbots so I presume they are still all in TT 3-3.
If you are familiar with your way in TT 3-3, there are two summonbots on the way to the first boss. One in the first mobs room just after you enter you enter TT, over by the door to the centre of TT 3-3. The next one in the second room of mobs, just before the first boss. The third one is still in an original spot after the first boss, in the little room off to the side.
I'll double check this when I log on then update the card bosses guide =3