5/10 AA hand

[diconoclastx]

Villain is lag/maniac whose VPIP is > 50. He is a winner though over 3000 hands. Villain likes to call many of hero's pf raises and then mostly call on the flop. He likes to push hero around if hero checks anytime during the hand. Villain and hero showed down an earlier hand where villain bet $500 on the river into a $200~ish pot with the undersfull, and hero paid off with two pairs. Effective stacks are about $1200 for this hand.

The hand:
I have AA. Button open raises to $40. Villain in sb calls.
Flop T65 rainbow. Villain checks. Hero pots. Villain pushes. What to do now?