Last page of #2. Much drama ensued and now we see how Prowl and Skippy joined Crescendolls (though they're not called that yet).
The voting system was fairly easy. Sari and Bulkhead voting for to trust Prowl comes within their nature: the former does not want to separate the family and is going by the logic of an eight-year-old girl. Bulkhead is quite a simple guy, but he's a rather generous soul. Bumblebee's dejection was a no-brainer because he's currently following his impulsive emotions and saying "No!". He will likely regret this later on, but stubbornly try to deny it. Ratchet was a bit harder because he's cranky, old, and cycnical enough to vote "no", but kind and sweet inside to say "yes". In this case, the combination of the former and what Prowl did in "A Fistful of Energon" is enough for Ratchet to do what he did.
And that only leaves Optimus...
You probably can't see it well, but the panel with Skippy as traces of bird feathers just behind him. Poor kitty doesn't really care about that right now.
Also, that last panel with Prowl's reflection looking as though he is starring at the real deal...well, it's done on purpose. Reflection Prowl disapproves of his real self!
Yes, Bumblebee will most likely regret that...
Optimus is going to get hell from Sari if he votes 'no'.